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The Scientific Revolution

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1 The Scientific Revolution
The Scientific Revolution marked the beginning of a dramatic shift in how people viewed the world. The medieval and early modern European outlook had been dominated by religion. As a result of this revolution, many came to see the world predominantly in secular and scientific ways. In the short term, the Scientific Revolution set the stage for the Enlightenment; its long-term repercussions can still be felt today.

2 What Was the Scientific Revolution?
A revolution in human understanding and knowledge about the physical universe 17th century Began with Kepler, Galileo Ended with Newton The Scientific Revolution is generally viewed as a 17th-century phenomenon. Most historians consider it to have started with the astronomical discoveries of individuals like Kepler and Galileo and ended with the publication of Newton’s major works. We will describe these “bookends” of the Scientific Revolution in greater detail later in this discussion.

3 The BIG PICTURE: The scientific revolution is historically important for three reasons: it laid the basis for our modern view of the world as a rational, ordered place it shifted the nature of discourse in "natural philosophy" from reason (deductive) to empirical (inductive) method Finally, it affected the thinking of a wide range of people from poets and philosophers to practical men of politics and economics

4 “Science” Before the Scientific Revolution
Based almost entirely on reasoning Experimental method or observation wasn’t used at all Science in medieval times Alchemy Astrology tradition More than anything else, science is a habit of mind. It involves using reason, observation, testing, and systematic thought to uncover truths about the world and about people, animals, and things in the world. “Science” as we know it today didn’t really exist before the Scientific Revolution. Instead, scientists in ancient and medieval times were really philosophers who drew conclusions based on deductive reasoning; they rarely conducted practical experiments. Much of what was considered “science” in medieval times had very little basis in fact and drew more from superstition and religious belief. Similar in many ways to chemistry, alchemy aimed to develop potions that would do things such as change iron into gold, cure all disease, or bestow immortality. Astrology was based on the concept that the positions and conditions of celestial bodies could influence human existence, both positively and negatively. Practitioners of astrology would often claim that human suffering (including sickness) could be explained by the position of the stars. A medieval alchemist

5 Factors Leading to the Scientific Revolution
Rise of universities Contact with non-Western societies The Renaissance Exploration A number of factors helped lay the groundwork for the Scientific Revolution: The first universities appeared during the Middle Ages. Although universities initially focused primarily on topics like law and philosophy, they gradually expanded their offerings and came to establish professorships in areas such as mathematics, astronomy, medicine, and other science-related disciplines. Universities brought together leading scientific minds, encouraged intellectual debate, and sparked interest in research and discovery. Muslim scholars of the Middle Ages made several important mathematical and scientific discoveries. During the 12th and 13th centuries, both the Crusades and the expansion of trade networks brought Europeans into greater contact with Muslim societies. Both cultural and intellectual exchanges occurred; this infusion of new ideas helped improve Europeans’ understanding of mathematical principles in particular and of science in general. As the Renaissance dawned and inspired advances in art and literature, educated Europeans began to look beyond the church and the Bible for knowledge and truth. In addition to serving as patrons of the arts, wealthy families such as the Medicis in Italy also supported scientific research. The Age of Exploration also provided impetus for the Scientific Revolution. The challenges of navigating across the Atlantic Ocean and around Africa motivated advances in mathematics, astronomy, and cartography (mapping). European monarchs interested in expanding their overseas empires (including King John of Portugal, King Ferdinand and Queen Isabella of Spain, and Queen Elizabeth I and King Charles II of England) provided funding and/or support for scientific research.

6 Rationalism Reason, not tradition, is the source of all knowledge
René Descartes (1596–1650) French philosopher and mathematician Cogito ergo sum (“I think, therefore, I am”) Deductive reasoning The philosophy of rationalism holds that all knowledge comes from reason. René Descartes was one of the most important philosophers and mathematicians of his time; many regard him as the father of modern rationalism. In Discourse on Method and The Meditations, he reasoned that all of his prior knowledge was subject to doubt because it was based on traditional beliefs rather than on reason. He pondered what he could honestly say he knew to be true, going so far as to doubt whether he was awake or dreaming—or if he even existed. He then began to reconstruct his world view: he knew that his thoughts existed, which then suggested the existence of a thinking being—himself. Descartes then came to his famous conclusion, “Cogito ergo sum,” which means “I think, therefore, I am.” Descartes’ conclusions were based on deductive reasoning, which involves using a general principle to draw conclusions about a specific instance. For example, once he had come up with Cogito ergo sum, he used it to draw a further conclusion: because the mind “cannot be doubted but the body and material world can, the two must be radically different.” In other words, Descartes drew a clear distinction between mind and matter—an idea that helped break down superstitions that had influenced science in the medieval era. René Descartes

7 Empiricism The belief that experience is the only true source of knowledge Roger Bacon Shift toward empiricism a hallmark of the Scientific Revolution Helped lead to the development of the scientific method The philosophy of empiricism holds that the only real way to acquire knowledge is through experience—that is to say, through observation. Empiricism stands in opposition to rationalism, which holds that knowledge could be acquired through the exercise of one’s reason alone. Some of the first writings on empiricism came in the 13th century from Roger Bacon, an English scholar. In his work Opus Maius, Bacon wrote, “There are two modes of knowledge, through argument and experience. ‘Argument’ brings conclusions and compels us to concede them, but it does not cause certainty nor remove doubt in order that the mind may remain at rest in truth, unless this is provided by experience.” One of the hallmarks of the Scientific Revolution was the new focus on empiricism. Empiricism also helped lead to the development of the scientific method. Roger Bacon

8 Francis Bacon and the Scientific Method
1561–1626 English philosopher and empiricist Inductive reasoning Argued for experimental methodology English philosopher Sir Francis Bacon laid the theoretical groundwork for what became known as the scientific method. His ideas about science incorporated what is known as inductive reasoning, which involves using concrete facts to extrapolate broader conclusions. (Inductive reasoning is the opposite of deductive reasoning.) Bacon argued that scientists should work from the specific (observable data) to the general (rules and theories based on that data). He believed that all scientific research should rely on careful observation and experimentation rather than simply relying on one’s own thought and reasoning, as earlier scientific thinkers had. The data obtained should then be recorded and analyzed according to logic and reason, then used to produce a testable hypothesis.

9 Science as a multiple-step process:
The Scientific Method Science as a multiple-step process: 1. Observe an object or phenomenon 2. Develop a theory that explains the object or phenomenon 3. Test the theory with experiments

10 Roots of Scientific Thought: Aristotle
4th century BCE Greek philosopher and scientist Wrote several scientific works His work laid the foundation for scientific study through the medieval era Gravity/Theory of falling objects Astronomy: Crystal spheres Aristotle was a Greek philosopher and scientist who lived in the 4th century BCE. He is considered one of the most influential philosophers in Western thought. Although much of his work concerned topics like politics and ethics, he also wrote many works concerning biology, zoology, and physics. His works provided the theoretical foundation for science for centuries to come. Although Aristotle came up with many brilliant insights into philosophy and government, in science he relied on reason rather than empirical evidence and did not conduct experiments; consequently, many of his conclusions were incorrect. For example, he hypothesized that gravity occurred because objects were attracted to the Earth’s core, and theorized that heavier objects would fall to earth more quickly than lighter ones. He also came up with a theory of astronomy which hypothesized that a motionless Earth lay at the center of the universe surrounded by concentric crystal spheres. One sphere held the moon, another the sun, others held each of the five known planets at the time, and the last held what the ancient Greeks referred to as the “fixed stars.”

11 Roots of Scientific Thought: Ptolemy
2nd century CE Greek astronomer, mathematician, and geographer The Almagest (Syntaxis) Geocentric (earth-centered) model of the universe Motion of the planets Ptolemy, another ancient Greek, was an influential mathematician, astronomer, and geographer who lived in the 2nd century CE. Around 150, he wrote the Almagest (also known as the Syntaxis), his most important work. In it, he provided a comprehensive overview of mathematical astronomy and formalized the concept of a geocentric (meaning “earth-centered”) model of the universe. He also offered detailed mathematical rules describing the motion of each of the planets.

12 Models of the Universe: Geocentric vs. Heliocentric
Geocentric: the Earth is at the center of the universe; all heavenly bodies move around the Earth Heliocentric: the Sun is at the center of the universe; all heavenly bodies move around the Sun—including the Earth Derived from the Greek words “geo” (meaning earth) and “centron” (meaning center), the geocentric view were generally the view pushed by Aristotle and Ptolemy (see above). Geocentricism was officially endorsed by the Catholic Church and taught at religious schools and universities. Derived from the Greek works “helios” (meaning sun) and “centron” (meaning center), the heliocentric conception was the most prominent theory pushed during the Scientific Revolution.

13 Nicholas Copernicus (1473–1543)
Polish astronomer and mathematician Commentariolus (1514) Concerning the Revolutions of the Celestial Spheres (1543) In 1514, Copernicus wrote Commentariolus, a short, handwritten notebook of observations in which he laid out the foundations of his heliocentric theories. He did not sign his name to Commentariolus and distributed it only to a few friends, fearing that the controversial nature of his thoughts might provoke the anger of the Catholic Church. The following year, however, he began to write Concerning the Revolutions of the Celestial Spheres, in which he expanded on the heliocentric model he had proposed in Commentariolus. He worked on the book for the rest of his life; it was finally published just before his death in Despite the importance of Copernicus’ work, at the time his theories did little more than spark debate among scientific thinkers and had little initial impact outside of academic circles. His ideas would provide the foundation for the revolutionary work of later scientists.

14 Tycho Brahe (1546–1601) Danish astronomer
Amassed accurate astronomical data Theorized a system distinct from both the Ptolemaic and Copernican ones Argued that the Moon and Sun revolve around the Earth while other planets revolve around the Sun BEST. DEATH. EVER. Tycho Brahe is more often referred to by his first name, not his last. He made a name for himself as an astronomy lecturer at the University of Copenhagen and in the late 1570s came to the attention to one of the great “enlightened monarchs,” Frederick II of Prussia. Frederick offered to provide the funds for Tycho to construct an observatory; built on an island near Copenhagen, Tycho’s Uraniburg observatory became regarded as the finest in Europe. At Uraniburg, Tycho designed and built several new astronomical instruments and used them to create some of the most accurate star charts of the time. He also owned both a paper mill and a printing press and self-published a number of his works, including The Dream, considered one of the first works of science fiction. Tycho is important largely because he gathered a huge amount of astronomical data with unprecedented accuracy. He also came up with a theory of the heavens that offered an alternative to both the Ptolemaic and Copernican models, arguing that the Sun and the Moon revolved around Earth while other planets in the solar system revolved around the Sun. The latter assertion helped answer observation-based criticisms about earlier conceptions of the Universe without requiring a heliocentric model of the universe.

15 Johannes Kepler (1571–1630) German astronomer and mathematician
Student of Tycho Didn’t agree with Tycho’s interpretation of data Disagreed with Copernicus, claiming that other bodies moved in elliptical motion, as opposed to circular motions Theorized three laws of planetary motion using Tycho’s data Kepler originally studied theology but ended up as a professor of mathematics. As a student of Tycho, he studied both his teacher’s works as well as the writings of Copernicus. Kepler claimed that while Tycho’s data was correct, his interpretations of the data were incorrect; he further argued that Tycho’s data actually proved Copernicus correct. Kepler also took issue with Copernicus’ claim that astronomical bodies moved in circles, asserting instead that they moved in elliptical patterns—an assertion that later proved correct. Kepler used Tycho’s data and his own observations to develop three laws of planetary motion and proved the core of heliocentric theory.

16 Kepler’s Three Laws of Planetary Motion
Law of Ellipses: Planets orbit the sun in elliptical patterns Law of Equal Areas: The speed of planetary motion changes constantly depending on the distance from the Sun Law of Harmonies: Compares the movement of all the planets, claiming a similarity in their motion Kepler’s data led him to propose three theories concerning planetary motion: The Law of Ellipses: Asserts that planets orbit the sun elliptically (i.e., in oval patterns). This law explained why theories that claimed that planets orbited the Sun or Earth in circular patterns were inconsistent with observed data. The Law of Equal Areas: Claims that the speed of planetary motion changes constantly depending on the planet’s distance from the Sun. Planets move faster when closer to the Sun, slower when further away. Law of Harmonies: Compares the movement of all the planets using ratios, claiming a similarity in the motions of all the planets in the galaxy.

17 Galileo Galilei (1564–1642) Italian mathematician, astronomer
“Father of Science” Telescopes and astronomical discoveries Theory of falling objects; disproved Aristotle Galileo is considered the father of modern physics, astronomy, and more generally the “Father of Science.” He created several different telescopes (improving the power of with each successive model) and used them to record extraordinary amounts of data. His interpretations of the data yielded some remarkable discoveries, including: Stars were farther away than planets There were mountains on the Moon Jupiter has four moons Saturn has rings He eventually compiled and published his observations in a 1610 work titled The Starry Messenger. Galileo’s work, combined with the previous discoveries of Copernicus and Kepler, left little doubt among the mainstream scientific community that the Ptolemaic model of the universe was incorrect. He also conducted a famous experiment in which he showed Aristotle had been mistaken in his assumption that objects of different weights falling at different rates of speed. Having proven this, he went on to establish an explanation of speed and motion. Galileo also created a thermometer, which permitted more accurate data collection. Galileo’s telescopic drawing of the moon

18 Dialogue on the Two Chief Systems of the World
Galileo’s major work Written in 1632 Argued in favor of the heliocentric model of the universe Galileo’s masterpiece was Dialogue on the Two Chief Systems of the World, in which he argued in favor of the heliocentric model of the universe. Dialogue was cleverly written as a series of discussions between three individuals over four days: Simplico, a simple-minded scholar, represented the geocentric view of the universe and supported Ptolemy’s and Aristotle’s ideas Sagredo, initially a neutral, intelligent layman Salviati, another scholar, presented the Copernican view of the universe; he also mixed in some of Galileo’s ideas along with criticisms of Simplico’s views Through this literary tool of a staged debate, Galileo argued for the Copernican view of the universe. Readers were left with little doubt about the “correct” view at the end. Although the Dialogue met with a mixed reception at the time because of its controversial nature, the work generally stood up to scientific criticisms for centuries to come. Frontspiece from the Dialogue; from left to right, the figures shown are Aristotle, Ptolemy, and Copernicus

19 Galileo vs. the Catholic Church
The church condemned heliocentric conceptions of the universe The Roman Inquisition Galileo’s trial Galileo recants, put under house arrest Galileo’s scientific observations proving that the Earth wasn’t at the center of the universe had vast religious implications. The Catholic Church perceived heliocentric theories as questioning long-held doctrinal teachings about the nature of the heavens. The Church ultimately found it easier to condemn the heliocentric view of the universe as “foolish” and “formally heretical” rather than figure out how it could fit into a religious framework. In 1630, Galileo had received conditional permission from the Vatican to publish the Dialogue. Months after its first printing in 1632, however, Pope Urban VIII ordered a halt to distribution of the book and created a special commission to investigate whether the work was heretical. The commission recommended that Galileo’s case be referred to the Roman Inquisition, which ruled on cases of suspected heresy. Galileo’s trial before the Inquisition tribunal began in April 1633. Galileo defended himself by arguing that while the Church had earlier told him not to hold or believe Copernican theories, it had never told him not to teach about them. The tribunal threatened Galileo with torture, imprisonment, and even burning at the stake if he refused to recant his views; eventually, he succumbed. Sentenced to house arrest due to his fragile health and advanced age, Galileo was forced to recite prayers every day and wasn’t supposed to be allowed visitors, though neither of these were well enforced. In spite of the toll it had taken on him both mentally and physically, Galileo’s battle with the Church didn’t dampen his intellectual curiosity, and he continued to write, research, and publish. The trial had a chilling effect on scientists practicing in Italy and pushed the focus of mainstream science north to places like England and France. It also highlighted the tensions between religion and science. 19th-century depiction of Galileo before the Inquisition tribunal

20 Sir Isaac Newton (1642–1727) English astronomer, physicist, and mathematician Synthesized the works of Copernicus, Kepler and Galileo The Principia Considered by many to be the greatest figure of the Scientific Revolution, Newton synthesized the works of Copernicus, Kepler, and Galileo in formulating his theories on gravity and motion. After decades of research, he presented the foundation of these theories (along with other observations concerning mathematics and geometry) in the Principia, perhaps the most influential science book ever written. The Principia presented a new view of the world, one expressed in entirely mechanical terms, with Newton portraying the universe as a large clock that operated by a consistent set of rules. The book was well received by the academic community of Europe at the time and his new world view became the accepted paradigm until the atomic age. Legend holds that Newton “discovered” gravity when an apple fell on his head from a nearby tree, although many believed Newton—who loved to tell stories—made the whole thing up.

21 Newton’s Laws of Motion
Law of Inertia: Argues that bodies in motion tend to stay in motion unless acted on by an outside force. This force can be something viable and obvious or something more subtle like gravity. Fundamental Law of Dynamics: Explains how the velocities of objects change when outside forces are applied. Considered the most important of the three laws of motion. Law of Reciprocal Actions: Posits that for for every action, there is an equal and opposite reaction. The central unifying element for Newton was that motion in the heavens was linked to motion on earth by the law of universal gravity. First Law: Law of Inertia Second Law: Fundamental Law of Dynamics Third Law: Law of Reciprocal Actions

22 Medicine Before the Scientific Revolution
Based on tradition The Church Illustration depicting a bloodletting, an accepted medical procedure before the Scientific Revolution Before the Scientific Revolution, many practitioners of medicine relied on theories that were centuries old and rarely based on anatomical research or observation. Medical treatments were at best ineffective and at worst lethal. In addition, the Church banned dissection, a practice critical in understanding the human body and how illnesses affect it. In general, the Church viewed sickness not so much as a physical disorder but as a spiritual punishment for sin; correspondingly, human intervention was seen as challenging the will of God.

23 Ancient Medicine: Galen (131–201 CE)
Greek physician On the Elements According to Hippocrates “Bodily humours” Two types of blood On the Use of the Parts of the Body Much of Galen’s work was based on Hippocrates, the Greek physician often called “the father of medicine.” In On the Elements According to Hippocrates, Galen refined Hippocrates’ ideas on “bodily humours.” The ancient Greeks believed that the human body was made up of four fluids: blood, phlegm, yellow bile, and black bile. An imbalance of these fluids could cause sickness or death. The theory of bodily humours inspired Greek, Roman, and medieval medical cures, including bloodletting (bleeding a patient in order to “draw off” an excess of a certain bodily humour), forced vomiting, and various alchemical potions. Galen also believed that there were different types of blood in the body and two different blood systems: the venus and arterial. Venus blood was created in the liver, while arterial blood was created in the heart. Blood brought “pneuma” or “spirituous air” throughout the body and was eventually used up, so it did not return to its place of origin for circulation. It was not known that the heart played a role in the movement of blood. Rather, doctors believed that the pulsing energy of the arteries themselves caused the blood to move throughout the body. Galen later produced a 17-volume work titled On the Use of the Parts of the Human Body. He based his conclusions in the book on research he had conducted on animals (mainly apes); consequently, On the Use of the Parts of the Human Body contained many errors, especially concerning the internal organs. For all his mistakes, however, Galen’s medical theories remained the standard for over a thousand years.

24 Medieval Medicine: The Catholic Church
Provided for care of the poor and the sick Minor clerics took on physician-like roles Eventually, university-trained physicians displaced clerical physicians During the Middle Ages, the Catholic Church assumed responsibility for taking care of the poor and the sick. Consequently, the Church also became the acknowledged authority on which medical practices were acceptable. Many lower-ranking clerics took on physician-like roles, since they were usually the ones charged with directly dealing with the sick. Church leadership was uncomfortable with this development because clerics who practiced medicine tended to shirk their religious duties. The Church began to pass canon laws that both regulated and limited the involvement of clergy in the practice of medicine. Eventually with the rise of universities, trained physicians began to replace clerical physicians. Clerics treat a royal patient with leeches

25 Andreas Vesalius (1514–1564) Belgian anatomist
On the Fabric of the Human Body Corrected many of Galen’s errors Andreas Vesalius pioneered the modern study of anatomy and wrote the first complete anatomy text, On the Fabric of the Human Body (De Humanis Corporis Fabrica). Published in 1543, the work consisted of seven volumes illustrated with fine engravings based on Vesalius’ own drawings. He had gathered information for the text largely through the many dissections of human cadavers he had performed. On the Fabric of the Human Body corrected many of Galen’s errors and revolutionized knowledge of human anatomy.

26 William Harvey (1578–1657) English physician
On the Movement of the Heart and Blood in Animals Described the functioning of the heart and circulatory system Disproved Galen’s theories In 1628, English physician William Harvey wrote On the Movement of the Heart and Blood in Animals, a work based on years of observation and dissection of both animal and human subjects. In the book, Harvey argued that blood was pumped through the body by the heart and constantly circulated; he also proved that the same blood flows in both veins and arteries. Harvey’s conclusions disproved Galen’s theories and created a basic model of blood circulation that is still recognized as the standard today.

27 Chemistry Joseph Priestley (1733–1804) Antoine Lavoisier (1743–1794)
Chemistry as we know it today didn’t really exist until the Scientific Revolution. Modern chemistry began with Robert Boyle, a British scientist who was the first to make a distinction between a chemical element and a chemical compound. He is most famous for Boyle’s Law, which states that the volume of a gas under compression is inversely proportional to the amount of pressure. Another British chemist, Joseph Priestley, was the first to isolate and identify oxygen. He also discovered other gases (including ammonia and carbon monoxide), wrote a book on electricity, and coined the term “rubber.” French scientist Antoine Lavoisier conducted several experiments involving combustion. He discovered not only that substances combine with oxygen when they burn, but also showed that water was made up of hydrogen and oxygen. In addition, he identified 23 other elements and invented a nomenclature (naming system) for chemical elements. Antoine Lavoisier (1743–1794) Robert Boyle (1627–1691)

28 Carolus Linnaeus (1707–1778) Swedish botanist
Classification and naming of flora and fauna The Swedish botanist Linnaeus developed a system for the classification and formal naming of all plants and animals by genus and species which is still used today. He also conducted research into hybridization, the process by which two distinct species cross-breed. Though Linnaeus initially theorized that species remained constant and didn’t change, towards the end of his life he did admit the possibility that a new species could arise through hybridization.

29 Jean-Baptiste Lamarck (1744–1829)
French biologist Early theory of evolution Philosophie Zoologique Lamarck’s “laws” In his famous work Philosophie Zoologique, French biologist Jean-Baptiste Lamarck proposed an early theory of evolution. He laid out two “laws”: the first stated that changes in an animal or plant’s environment can cause modifications in behavior, which in turn can lead that animal or plant to either make greater or lesser use of a certain body part or structure. These parts or structures then either enlarge or shrink, depending on increased use or disuse. Lamarck’s second “law” posited that these changes to body parts and structures subsequently get transmitted to an organism’s offspring. Largely discredited during his lifetime, Lamarck was later praised by Charles Darwin as having been one of the first to recognize changes occurring in the organic world.

30 Mathematics Math symbols for addition, subtraction, multiplication and division Analytical geometry: Descartes Calculus: Newton + The modern signs for mathematical operations were created by Francois Vieta in France in 1603 and were adopted as standard during the Scientific Revolution. In addition, new branches of mathematics arose: René Descartes came up with analytical geometry and Sir Isaac Newton invented calculus, the study of rates of change. -

31 New Invention: The Telescope
Invented in the Netherlands Galileo Newton The telescope was invented in the Netherlands in the late 16th century. Until Galileo made improvements to it in the early 1600s, it had not really been widely used as a practical tool for scientific observation. Sir Isaac Newton made further refinements in the early 1700s when he invented the reflector telescope, which uses a curved mirror to magnify objects to a much greater degree than a simple glass lens is capable. Illustration of Galileo at his telescope

32 New Invention: The Microscope
Hans Janssen Anton Van Leeuwenhoek Robert Hooke Considerable scholarship exists tracing the origin of the microscope. The first simple microscopes appeared during the Renaissance, but were limited both in power and in the range of tasks for which they could be used. Around 1590, Dutch spectacle makers Hans Janssen and his son Zacharias began to construct compound microscopes, which used several lenses and produced much greater magnification of objects. In the mid-1600s, another Dutchman named Anton Van Leeuwenhoek developed new methods for grinding and polishing tiny lenses of great curvature which gave magnifications up to 270 diameters, the finest known at that time. He used these lenses to build vastly improved microscopes and make several groundbreaking observations: he was the first to see bacteria, blood corpuscles, and the “life” found in a drop of water. In the 1660s, Robert Hooke of the Royal Society of London improved on Leeuwenhoek’s microscope and performed a series of weekly demonstrations to show the power of the instrument. In 1665, he wrote Micrographia, a finely illustrated compendium of microscopic observations that also used the word “cell” as a biological term for the first time; the book sparked increased public interest in microscopy. Hooke’s drawing of a flea (from Micrographia) A Janssen microscope, c.1600

33 New Invention: The Pendulum Clock
Invented by Christiaan Huygens, a 17th-century Dutch scientist Allowed scientists to more accurately measure time Galileo had sketched out a similar design for a pendulum clock in the late 1500s, but it never was built. Huygens’s prime innovation was the balance wheel and spring, which allowed clocks of the era to keep time accurate to within ten minutes a day. Later enhancements in the mid-1700s brought that margin of error down to 10 seconds. Watches and clocks were built in all sorts of shapes and sizes using the pendulum concept, including portable devices that allowed for timing at remote or field locations. Huygens’s design for a pendulum clock

34 New Invention: Barometer
Invented by 17th-century Italian physicist Evangelista Torricelli The barometer measures air pressure The barometer was the brainchild of Evangelista Torricelli, an Italian student of Galileo. Torricelli was trying to create a perfect vacuum and during the course of his experiments, he noticed that atmospheric pressure affected the height to which a fluid would rise in a tube he was using. The barometer’s ability to measure air pressure can be used in weather prediction. High pressure generally predicts moderate weather while low pressure generally predicts storms. Torricelli’s barometer experiment

35 New Invention: Thermometer
Invented in the 17th century by Santorio Santorio, an Italian scientist Ferdinand II Gabriel Fahrenheit Anders Celsius Not surprisingly, Galileo had created a rudimentary thermometer; however, the invention of the thermometer is credited to Santorio Santorio, an Italian noble. He is also credited for proposing the medical use of the thermometer. Santorio’s thermometer was not very accurate because it was an air thermometer, which meant it was unsealed. In 1654, Ferdinand II, the Grand Duke of Tuscany, invented the first sealed thermometer using alcohol as the liquid. In 1714, German-born Dutch instrument maker Gabriel Fahrenheit created a much more accurate thermometer by using mercury instead of alcohol. Fahrenheit also invented the first standard temperature scale, which is used today in the United States. Many other countries use the Celsius scale, which was devised by Swedish scientist Anders Celsius in 1742. Santorio Santorio Illustration depicting Santorio’s thermometer

36 New Invention: Mechanical Calculator
Invented by Wilhelm Schickard, a 17th-century German inventor Gottfried von Leibniz’s “Step Reckoner” Schickard corresponded with Kepler in the 1620s and described a design he had for a “calculating clock” that could perform complex numerical calculations. Schickard’s machine could add, subtract, multiply, and divide. Later in the 17th century, German mathematician Gottfried von Leibniz built upon both Schickard’s model and one created by French mathematician Blaise Pascal to create a “Step Reckoner” that could also do square roots. All these machines were forerunners of modern-day computers. Wilhelm Schickard A 1624 sketch Schickard made of his calculator

37 The Significance of the Scientific Revolution
Abandonment of ancient and medieval systems Development of the scientific method The Enlightenment The most obvious result of the Scientific Revolution was the rejection of ancient and medieval systems in science, astronomy, and medicine. After the Scientific Revolution, many previously accepted theories had been completely disproved or discarded. The methods developed during the Scientific Revolution would fuel discoveries for centuries to come. Basing science more firmly in empiricism made conclusions more consistent, reproducible, and accurate. The Scientific Revolution also set the stage for the Enlightenment. Like the pioneers of the Scientific Revolution, Enlightenment thinkers strove to make conclusions based on observation, logic, and reason, rather than on faith. Though the Scientific Revolution had little immediate impact on society as a whole, its long-term repercussions can still be felt today. Perhaps more important than the specific advances in science, the Revolution represented a shift in worldview: it was an intellectual revolution that changed the way that people saw and interpreted the world around them.

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