Lathes Page: 16
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11 AIR CORPS
be held at right angles to the axis of the cylinder and moved gently
back and forth across its diameter to arrive at an accurate measure-
ment (fig 10).
c. When setting the inside calipers to the rule the end of the rule
should be set squarely against a flat, metal surface. One leg of the
calipers is placed on this surface and against the rule and the
FIGURE 10.-VSing outside caliper.
other leg extended to the reading desired (fig. 11). To measure
inside diameters, the caliper is held square across the diameter of
the hole and the caliper points moved, as shown in figure 12, while
the adjustment is made.
FIGURE 11.-Setting inside caliper.
d. Screw thread calipers have legs that are bent and dressed to a
wedge shape to fit into the thread. Measurements made with screw
thread calipers are usually transfer measurements from a finished
screw thread to a like thread being cut.
e. The hermaphrodite caliper, which has one leg hooked like the
ordinary caliper and the other pointed like a divider leg, is used for
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United States. Army. Air Corps. Lathes, book, November 29, 1940; Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc96655/m1/18/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.