1. Juraj Olejňák & Samo Majerník

2.   He is consiedered as a father of helicopter  1895 – presented his first concept of helicopter in Bratislava  He was improving his invention for years till first real flight of his invention in 1901  Many other inventors used his concept and created their own Ján Bahýľ

3.   Finally he could not get enough resources to build his invention in bigger scale  Louis Brequet and Paul Cornu had found investor and now are official inventors of helicopter Ján Bahýľ

4.   He was born on 28th November, 1870 in Neštich and died on 2nd of January, 1941 in Neštich  1907 - he moved to USA  1913 - he designed and constructed the first parachute on the principle of umbrella Štefan Banič

5.   1914 – he jumped from the 15-floors high building in Washington and showed ´ representatives of the Patent Office, that his parachute is working.  His parachutes were used by American pilots in first World War. Štefan Banič

6.   Important constructor of mine pumping machines  Born on 15th of May, 1713 in Banská Štiavnica  In his 25, he build pumping pumping machine made all from wood that could siphon 200 litres per minute into the height of 80 meters Jozef Karol Hell

7.   He soon became main mechanical foreman in Štiavnice mines  He was the first man who used compressed air in his machines  His machines were used all around the world not just in mines but also in oil rigs Jozef Karol Hell

8.   He was born on 17th February, 1864 in Tajov and died on 11th May, 1929 in USA  1896 – he moved to USA  27th April 1905 – He made a first radio transmission of the spoken word, so he actually invented a radio. Jozef Murgaš

9.   23th November, 1905 he organized a radio communications that took place between the villages of Scranton and Wilkes-Barre, spaced 30 km.  He also invented wavemeter, electrical transformer and Reel for fishing rod Jozef Murgaš

10.   One of the biggest names in electrotechnics in 19. century  Born on 11th of January, 1800 in Zemné  1828 – build small electromagnet for his experiments with elecrticity - which is basically electric motor  He did not published his discovery so he did not became famous Štefan Anián Jedlík

11.   He invented principe of electromagnetic rotations  He invented many machines (some says around 80), like electric dynamo, electric locomotive, pipe lighting collector and how to make a soda water  He is author of physics textbook Štefan Anián Jedlík

12.   Physicist, mathematician and inventor Jozef Maximilian Petzval is considered as the founder of modern optics. He was born in 1807 in Spišská Belá and died on 17th September, 1891 in Vienna  In 1840 he invented a photographic lens. Jozef Maximilián Petzval

13.   He also proposed the concept of projectors, telescopes, and various improvements in labor microscope.  His main contribution to modern optics was mainly the calculation of the correction optical systems. Jozef Maximilián Petzval

14.   http://www.slovenskivynalezcovia.webz.cz/index2 osbnosti.htm http://www.slovenskivynalezcovia.webz.cz/index2 osbnosti.htm  http://magazin.atlas.sk/techmag/najvacsie- slovenske-vynalezy/793018.html http://magazin.atlas.sk/techmag/najvacsie- slovenske-vynalezy/793018.html Sources

15.  Thank you for your attention Juraj olejňák & Samo Majerník 3.A