10The vernier caliper takes the most skill to read, and this is the type you will be using in experiment X.3.
11These are the main features of a typical vernier caliper: Small jaws (for inside measurements)Depth gaugeMetric vernier scaleMetric fixed scaleBeamJaws (for outside measurements)English vernier scaleEnglish fixed scale
12Introduction and Example 1 ReadingtheMetric CaliperIntroduction and Example 1
13Reading a CaliperAs you are about to see, using a vernier caliper is not difficult.You only need to make two readings: one from the fixed scale and one from the vernier portion.
14Reading a caliperStart by obtaining a measurement from the fixed scale...This is the fixed scale used for the metric readings.
15Reading a caliperUse the zero line on the vernier to locate your position on the fixed scale.
16Reading a caliperHowever, since your final reading is normally in millimeters, you need view these amounts as millimeters.Each number printed on themetric scale represents centimeters.6 cm7 cm8 cm9 cm10 cmetc.
17Reading a caliperJust mentally add a 0 (zero) by each centimeter number.60 mm70 mm80 mm90 mm100 mm
18Reading a caliper: metric Since there are ten spaces between each numbered interval, these smallest spaces must be 1 mm each.For example, this would be 91 mm...For example, note the ten spaces in this interval.…this is 92 mm...The smallest interval on this scale is 1mm.…93 mmetc.
19Reading a caliper: metric As you can see in this problem, we have a fixed scale measurement of 63 mm.The reading is 63 mm since the zero line has gone just beyond the 63 mm mark, but hasn’t reached the 64 mm mark.
20Reading a caliperTo finish we must obtain a reading from the metric vernier scale.On this scale, each line represents 0.05 mm..05 mm.10 mm.15 mm.25 mm.20 mmetc..30 mm.35 mm
21Reading a caliperWe need now to look for the point at which the fixed scale “lines up” with the vernier.This is read as .50 mmIt appears that these two lines, “line up” the best.
22Reading a caliperSo based upon the two readings (one from the fixed scale, and one from the ruler) the length must be 63 mm mm = mm63 mm+.50 mm63.50 mm
25Reading a caliperFirst take a reading from the fixed scale. Use the zero line from the vernier to help.The zero line is close, but not quite up to, the 20 mm line. It has gone beyond the 19 mm line however.Remember that we need to read the fixed scale in terms of millimeters.19 mm
26Reading a caliper: metric To finish, read the vernier scale.This is read as .35 mmIt appears that these two lines, “line up” the best.19 mm.35 mm
27Reading a caliper: metric The final reading then is mm.19 mm+.35 mm19.35 mm
29Reading a caliper: metric Let’s go through one more example.
30Reading a caliper: metric Use the zero line from the vernier scale to help get a reading on the fixed scale.The zero line is directly above the 8 mm line.Remember that we need to read the fixed scale in terms of millimeters.8 mm
31Reading a caliper: metric That’s it! Since the zero line on the vernier matched up with a line on the fixed scale, you quit right there.The final reading is 8.00 mm
33Reading a caliperDo this one on your own. Click to see the answer.
34Reading a caliper Start with the fixed scale reading. 66 mm The zero line is close to, but does not quite reach the 67 mm line. It has gone beyond the 66 mm line however.Remember that we need to read the fixed scale in terms of millimeters.66 mm
35Reading a caliper: metric To finish, read the vernier scale.This is read as .60 mmIt appears that these two lines, “line up” the best.66 mm.60 mm
36Reading a caliper: metric The final reading then is mm.66 mm+.60 mm66.60 mm