Step 3: Read the distance using the Vernier scale. Step 3A: Note the line on the main scale that is directly in front of the first line on the Vernier scale.This gives the distance in millimetres; in Fig 11.13 this value is 2.
Step 3B: Note the line on the Vernier scale that lines up precisely with any line on the main scale. This improves the accuracy to one decimal place; in Fig 11.13 this value is 7.
2.0 mm 1
10 0123456 8910 7 0.7 mm 2.7 mm
Step 3C: Combine the two readings taken to give the distance in millimetres, accurate to one decimal place. In Fig 11.13 this value is 2.7 mm.
SAMPLE PROBLEM 11C What is the distance on the Vernier callipers shown in Fig 11.14?
1 5 10 15 012345678910 Fig 11.14 20 Fig 11.13
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SAMPLE ANSWER 11C
Step1: The first line on the Vernier scale lines up a little bit past 5. Step 2: The line on the Vernier scale that lines up best with the main scale is 6. Step 3: The distance is 5.6 mm.
EXERCISE 11.1VERNIER SCALE ON A VERNIER CALLIPERS
1. What is the measurement on the Vernier scale shown in Fig 11.15?
1 5 10 15
012 3 4 5678910 Fig 11.15
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2. What is the measurement on the Vernier scale shown in Fig 11.16?
