USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 3/TASK 1
USING A 6 INCH RULE.
(b) Short Rule and Holder. Figure 171 on the following page shows
how a short steel rule with holder may be usefully applied to a measurement
in a recess inaccessible to the longer type rule.
(c) Narrow Rule.
The narrow rule is used to advantage
measuring the depth of a narrow slot (figure 172 on page 223).
(d) Hook Rule. Figure 168 on the previous page shows applications
of the hook rule. In one case, the hook serves to line up the end of the
rule with the edge of the shoulder from which the measurement is taken; the
other case shows the hook being used from the square edge of a part.
(e) Shrink Rule. A shrink rule is used to check a dimension on a
pattern, as shown in figure 173 on page 223, and at the same time to
automatically compensate for the amount of shrinkage of the metal after
casting or molding.
(f) Key Seat Clamps and Rule. Figure 174 on page 224 illustrates
the method of scribing a line on cylindrical stock, using key seat clamps
and a rule.