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and   the   units   used.   Remember   that   your dimensions  must  always  be  expressed  in  one  kind of unit of measure; for instance, if you are using the meter, all dimensions must be in meters. The basic units of volume that you might be using are as  follows: UNITS  OF  WEIGHT The units of weight most frequently used in the  United  States  for  weighing  all  commodities except  precious  stones,  precious  metals,  and  drugs are  the  units  of  the  so-called  AVOIRDUPOIS system.   Avoirdupois   units   of   weight   are   as follows: Precious   stones   and   precious   metals   are usually weighed in the United States by the system of  TROY  weight,  in  which  there  are  12,  rather than 16, oz in the pound. Drugs are weighed by APOTHECARIES’  weight,  in  which  there  are also  12  oz  in  the  pound. The basic unit of the metric system of weight is the GRAM, which contains 15.432 grains. The GRAIN  was  originally  supposed  to  be  equal  to the weight of a single grain of wheat, The gram of 15.432 grains is also used in the avoirdupois, troy,  and  apothecaries’  system  of  weights. Multiples  and  subdivisions  of  the  basic  unit of metric weight (the gram) are named according to  the  usual  metric  system  of  nomenclature,  as follows: A  METRIC  TON  equals  1,000  kilograms, which  equals  1.1  short  tons. The Engineering Aid is interested in the weight of his instruments and the pull to be applied to the  ends  of  the  tape  to  give  correct  linear measurements.  The  common  units  of  weight  in surveying   are   the   OUNCE,   the   POUND,   the GRAM,   and   the   KILOGRAM.   The   following tabulation  gives  the  relationship  between  these units: UNITS  OF  ANGULAR  MEASUREMENT ANGULAR   or   CIRCULAR   MEASURE   is used for designating the value of horizontal and vertical angles. For general use in the measure- ment of angles, the circumference of the circle is divided  into  some  even  number  of  equal  parts. The unit of angular measure is the angle at the center of the circle subtended by one of the small subdivisions  of  the  circumference.  The  various units  of  angular  measure  are  known  as  UNITS OF  ARCS.  In  practice  these  units  of  arcs  may be  further  expressed  in  decimal  or  fractional parts. The  Engineering  Aid  may  encounter  three systems of angular measure in the use of surveying instruments.   They   are   the   sexagesimal,   the centisimal  or  metric,  and  the  mil  system. 1-29

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