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STEEL AND ITS HEAT TREATMENT
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TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 GENERAL INFORMATION GLOSSARY OF TECHNICAL AND MECHANICAL TERMS Absorption The  action  of  a  material  in  extracting  substance  from the atmosphere (water from air, etc.  ). Allowance Covers  variation  in  dimensions  to  allow  for  different qualities of fits. Alloy Steel A  steel  which  owes  its  characteristic  properties  chiefly to  the  presence  of  one  or  more  elements  other  than  carbon; i.e., nickel, chromium, vanadium, molybdenum, etc. Angle The  difference  in  direction  of  two  lines  which  meet  or tend  to  meet.    The  lines  are  called  sides,  and  the  point  of meeting'   the   vertex   of   the   angle.      They   are   measured   by degrees  and  by  radians.    One  degree  is  equivalent  to  the angle  at  the  center  of  a  circle,  subtended  by  an  arc  whose length    equals    one    three    hundred    sixtieth    (1/360)    of    the circumference.  One radian is equal to the angle at the center of  a  circle  when  subtended  by  an  arc  equal  in  length  to  the radius of the circle.  One radian equals 57.2958 degrees; also 1 radian equals 180/ r. The protractor is used for the measurement of angles. A  right  angle  is  one  which  is  formed  by  the  radius  moving through  1/4  of  the  circumference.    It  is  a  square  angle  and contains 90°. An  acute  angle  is  one  containing  less  than  90°.    An obtuse angle is one containing more than 90°. An oblique angle may be any other than a right angle. A reflex angle is one containing more than 180° . A helical angle is the angle of a thread at the pitch line with the axis of a threaded part; the lead angle of a thread is the  total  or  included  angle  between  the  sides  or  walls  of  a thread measured on the axial line. A dihedral angle is one formed by the opening between two intersecting planes. The vertex of an angle is the point of intersection of the two lines which form the angle. Brinell Test A hardness-testing instrument, employing the hardened steel ball indentation method. B.T.U. Abbreviation  for  British  Thermal  Unit  which  represents the  amount  of  heat  required  to  raise  the  temperature  of  one pound of water one degree Fahrenheit at or near 37°F.  There are 778 foot-pounds of energy in a B.T.U.  and 42.4 B.T.U.  to one horsepower. Calibrate To  ascertain  the  accuracy  of  and  to  rectify  same,  as regards a precision measuring instrument, etc. Calorie Any  of  several  thermal  units,  as:  (a)  The  amount  of heat  (small  calorie)  required  to  raise  the  temperature  of  one gram of water one degree Centigrade.  (b) The amount of heat (large  or  great  calorie)  required  to  raise  a  kilogram  of  water one  degree  Centigrade.    (1  great  calorie  equals  1000  small calories.) Cantilever A  projecting  beam,  bar,  or  member  supported  at  one end only. Center of Gravity That  point  in  a  body  about  which  all  the  parts  exactly balance each other. CTS-2128-L  Page 7 PRINTED IN UNITED STATES OF AMERICA

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