Figure 3-7. Cistern micrometer.

TM 9-6685-202-14

mm. If the slide was raised 0.5 millimeters, 632.5 would

the main scale. Except tor 0 and .5, there can be only

one vernier scale line aligned with a main-scale line it

be read from the main scale and .42 from the vernier

scale, making the correct reading 632.92 mm.

any given position of the vernier slide. Thus, in figure 3-

6 the zero line on the vernier scale has passed the 632-

3-11. Reading the Micrometer (Fig. 3-7)

line on the main scale and the first line past the four

a. The point of the micrometer is adjusted toward

tenths line on the vernier scale aligns with a line on the

the mercury surface until the

main scale. The entire reading is, therefore, 632.42

MI (C) 6685-202-14-3-7

Figure 3-7. Cistern micrometer.

3-13