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Fahrenheit Scale

A vernier cal...

Question

A vernier callipers has its main scale graduated in mm and 10 divisions on its vernier scale are equal in length to 9 mm. When the two jaws are in contact the zero of vernier scale is ahead of zero of main scale and 3rd division of vernier scale coincides with a main scale division. Find (1)the least count and (2) the zero error of the vernier calliper.

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Solution

Dear Student ,

$l e a s t c o u n t = l e n g t h o f o n e m a i s c a l e r e a d i n g - l e n g t h o f o n e v e r n i e r s c a l e r e a d i n g = 1 m m - \frac{9}{10} m m = 1 - 0.9 m m = 0.1 m m = 0.0001 m Z e r o e r r o r : (n o . o f d i v i s i o n s o n a u x i l l a r y - n o . o f d i v i s i o n c o i n s i d e) \times l e a r c o u n t o f v e r n i e r s c a l e : = (10 - 3) \times 0.1 = 0.7 m m t h i s i s t h e p o s i t i v e z e r o e r r o r .$

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