Discussion
A Metric outside Micrometer of range 100-125 mm is used to measure the diameter of a rod. Barrel graduation showed 14.5 and the thimble graduation in line with the barrel datum line was 18. What is the diameter of the rod?
Answer: C
The diameter of the rod is 114.68 mm.
A 100-125 mm micrometer reads from 100 mm, so its scale reading must be added to 100. A metric micrometer with 0.5 mm pitch and 50 thimble divisions has a least count of 0.01 mm:
\[ \begin{aligned} \text{reading} &= 100 + 14.5 + 18 \times 0.01 \\ &= 100 + 14.5 + 0.18 = 114.68\ \text{mm} \end{aligned} \]
14.68 mm forgets the 100 mm starting size of the instrument, and 14.70 mm forgets it too. 114.18 mm drops the 0.5 mm half-division showing on the barrel.
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