c The line of the thimble that

coincides with or has passed

the revolution or long line

in the barrel (7) ................. 16 = 0.016 in.

TOTAL _____________

= 0.241 in.

(b) *Reading a Vernier Micrometer.*

1 Reading the vernier micrometer (figure 38) is the same as

reading the standard micrometer, except that an additional step must be

taken, which is to add the vernier reading to the regular dimensions. This

allows for precise measurements which are accurate to ten-thousandths

(0.0001) of an inch.

This scale furnishes the fine readings between the

lines on the thimble rather than making an estimate as one would make on a

standard micrometer.

FIGURE 38.

READING A VERNIER MICROMETER.

2 There are ten spaces on the vernier micrometer, (figure 38,

view A, (1)). Therefore, each unit on the vernier scale is equal to 0.0009

of an inch, and the difference between the sizes of the units on each scale

is 0.0001 of an inch.

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