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Table 5-6.  Temperature Conversion
TM-9-254 Gearcase Transfer M548 M548A1 (
Figure 5-1.  Artillery mil to Degree conversion Chart
TM 9-254 5-8. Mil System. a. The artillery mil system is a means of angular measurement that lends itself to simple mental arithmetic.  It provides accuracy within the limits demanded by the military forces with distinct advantages of simplicity and convenience not afforded by any other method of angular measurement.  It is based on an arbitrary unit of measurement known as the mil.  The mil is exactly 1/6400 of a complete circle b. The mil is very nearly the angle between two lines which will enclose a distance of 1 meter at a range of 1,000 meters.  Exact computation of the distance enclosed at 1,000 meters by 1 mil gives the result of 0.982 meters. Therefore in assuming that 1 mil encloses 1 meter at 1,000 meters, an error of 0.018 meter or 1.8 cm is introduced.  This error is negligible for all practical purposes in the use of fire control instruments c. A  circle  of  1,000  meters  radius  would  have  a  circumference  of  6,283  meters.    A  1  meter  portion  of  the circumference would be the 1/6283 fractional part of a circle.  By choosing the mil as the 1/6400 fractional part of a circle, sufficient accuracy is retained for all practical purposes while the number can be handled easily by mental arithmetic. d. The mil provides an extremely small unit of angular measurement that is easily adaptable to the small angles encountered by the artillery man.  For example, if an object has an angular width or height of 1 mil, it is 1 meter wide or high at 1,000 meters; 2 meters wide or high at 2,000 meters; and so on.  In angular height, a man is approximately 2 mils tall at 1,000 meters or 1 mil tall at 2,000 meters NOTE The Navy mil and the French infantry mil are exactly 1 meter at a range of 1,000 meters.  There are 6283.1853 Navy or French infantry mils in a complete circle. e. For  quick  approximate  conversion  from  artillery  mils  to  degrees,  or  vice  versa,  refer  to  figure  5-1.    On  this chart locate the number of degrees or mils to be converted  Directly across the black line of arc is its equivalent f. A more exact conversion from artillery mils to degrees, minutes, and seconds is listed in table 5-8. Example: Convert 2,569 mils to degrees 2,000 mils = 112° 30' 0'' 500 mils    = 28° 7' 30" 60 mils    = 22' 30" 9 mils    = 0 30' 22.5" 143 89' 82.5" 2,569 mils    = 144° 30' 22.5" 5-17

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