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Figure 4-16.  Thickness Gage
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Using the Rule
TM 9-254 Section II.  MEASURING TECHNIQUES AND SCRIBING 4-3. General. Measuring  tools  are  designed  for  measuring  work  accurately.    They  include  calibrated  measuring  tools  such  as  (rules, precision  tapes,  and  micrometers)  designed  to  measure   distances   in   accordance   with   one   of   several   standards   of measurement. 4-4. Types of Rules. Steel rules (fig. 4-17) are available from a fraction of an inch in length up to 4 feet or more, but in machine shops the steel machinist rule is the one most commonly used. There are also several standard systems of graduations.  In the English system, rules are graduated in 10ths, 20ths, 50ths, and 100ths; 16ths, 32nds, and 64ths of an inch.  In the Metric system, rules  are  graduated  in  millimeters  and  one-half  millimeters.    Some  steel  rules  have  four  scales,  two  on  each  side  (one graduated in 32nds and the other in 64ths) with the scales on the reverse side running in the opposite direction.  There are rules made that have both an inch scale and millimeter scale, which makes this type rule adaptable to work involving both systems  of  measure.  Another  feature  on  some  rules  is  a  scale  etched  across  the  end  of  the  rule  which  facilitates measurement in restricted places. Figure 4-17.  Types of Steel Rules 4-14

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