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Figure 4-19.  Measuring Technique
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Table 4-2.  Conversion - Millimeters to Inches
TM 9-254 4-5. Using the Rule - Continued (3) Move the steel machinist rule along the stock being measured until the opposite end of the rule is alined with the mark made in (2) above B (fig. 4-19). (4) Insure that the edge of the rule is placed against the stock and make another mark, on the stock, at the 6 inch measurement. (5) Continue  to  move  the  steel  machinist  rule  along  the  stock  and  mark  each  6  inch  measurement  as described in steps (3) and (4) above until the entire length of the stock has been measured. (6) Count  the  number  of  marks  on  the  stock  and  multiply  by  the  length  of  the  rule  used  to  make  the measurement. Example 1: In this example a steel machinist rule is used to measure 18 inches of stock.  There are three marks on the stock. 3 marks x 6 inches (length of rule) = 18 inches (7) If   the   length   of   the   stock   to   be   measured   is   not   an   equal   multiple   of   the   rule   used,   make   the measurement as described in steps (1) through (6) above and add to that the length of any remaining portion of stock that is shorter than the rule. Example 2: In this example a 6-inch pocket rule is used to measure 23 inches of stock.  There are three marks on the stock with 5 inches remaining. 3 marks x 6 inches (length of rule) + 5 inches (portion of stock shorter than the rule ) = 23 inches. 4-6. Standards of Length. Two systems, the English and Metric, are commonly used in the design of measuring tools for linear measurements.  The English  system  uses  inches,  feet,  and  yards,  while  the  Metric  system  uses  millimeters,  centimeters,  and  meters.    In relation to each other 1 inch is equivalent to 25.3995 millimeters, or 1 millimeter is equivalent to 0.039370 inch.  Refer to tables 4-2 through 4-7 to facilitate conversion between systems. 4-17

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