theory of, 130 use of, 130 Interpolation, 96 Inverse proportion, 65 Iron and steel, colors at different temperatures, 167 Jack screws, 133 efficiency of, 135 mechanical advantage of, 134 Law of right triangles, 89 Least common denominator, 10 classes of, 117 compound, 118 mechanical advantage of, 119 Linear expansion, coefficient of, 169 Machines, types of, 115 Mean effective pressure, 146 square, 76 Measures of length, 7 of time, 7 of volume, 80 Mechanical advantage of differential pulley, 127 hydraulic jack, 156 inclined plane, 131 jack screw, 134 lever, 119 tackle blocks, 125 wedge, 132 efficiency of an engine, 151 Metals, weights of, 82 Micrometer, the, 40 Mill, the, 28 Mixed numbers, 3 multiplication of, 18 reduction of, 6 Money, U. S., 24 addition, 25 division, 26 multiplication, 26 reducing cents to dollars, 28 reducing dollars to cents, 27 subtraction, 26 the "mill," 28 Multiplication of decimals, 36 fractions, 17 mixed numbers, 18 whole numbers and fractions, 17 Nature of heat, 163 Numbers, mixed, 3 multiplication of, 18 Numerator of a fraction, 2 Percentage, 44 Speeds, rim, 54 Square measure, 76 table of, 77 root, 75 by table, 99 extracting, 86 meaning of, 85 rules for, 88 roots of numbers, table of, 103 Steam and air, 159 engines, 145 horse power of, 145 Strengths of bolts, 175 of cables and wire ropes, 177 of chains, 177 of hemp ropes, 177 of wire ropes and cables, 177 of fractions, 12 Surface speed, 54 Tables, areas of circles, 101 bolt table-U. S. standard thread, 176 coefficients of expansion, 170 cube roots of numbers, 103 cubes of numbers, 103 cutting speeds, 58 decimal equivalents, 42 explanation of, 95 measures of length, 7 of time, 7 miscellaneous units, 7 square measure, 77 roots of numbers, 103 squares of numbers, 103 U. S. money, 28 weights of castings from patterns, 84 of materials, 83 Tackle blocks, mechanical advantage of, 125 Temperatures, 164 of iron and steel by color, 167 |