i/ 111 TABLE OF CONTENTS. 



75. Strength of copper-tin alloys (bronzes) 73 



76. " copper-zinc alloys (brasses) 73 



77. " " copper-zinc-tin alloys 73 



78. Moduli of rigidity 74 



79. Young's modulus of elasticity ' 75 



80. Effect of temperature on rigidity 76 



81. Values of Poisson's ratio 76 



82. Elastic moduli of crystals, formulae 77 



83. " " " " numerical results . 78 



84. Compressibility of nitrogen at different pressures and temperatures . 79 



85. " " hydrogen " " " " " . 79 



86. " " methane " 



79 



87. " ethylene " . 79 



88. " " carbon dioxide" " " " value of/?/ 80 



89. " " " " " "values of 



the ratio p"v/p\Vi ...*.... 80 



90. " air, oxygen, and carbon monoxide at different pres- 



sures and ordinary temperature 80 



91. " sulphur dioxide at different pressures and tempera- 



tures 8 1 



92. " ammonia at different pressures and temperatures . 81 



93. and bulk moduli of liquids 82 



94- " " " " " solids 83 



95. Density of various solids 84 



96. " " " alloys 85 



97. " " " metals 86 



98. " " woods 87 



99. " " " liquids 88 



100. " " " gases 89 



101. " " aqueous solutions of salts 90 



102. " " " water between o and 32 C 92 



103. Volume of water at different temperatures in terms of its volume at 



temperature of maximum density 93 



104. Density and volume of water in terms of the density and volume at 



4 C 94 



105. " " mercury at different temperatures 95 



1 06. Specific gravity of aqueous ethyl alcohol 96 



107. Density of aqueous methyl alcohol 97 



108. Variation of density of alcohol with temperature 98 



109. Velocity of sound in air, principal determinations of 99 



no. " " " " solids 100 



in. " " " liquids and gases 101 



112. Force of gravity at sea level and different latitudes ., 102 



113. Results of some of the more recent determinations of gravity .... 103 



114. Value of gravity at stations occupied by U. S. C. & G. Survey in 1894 . 104 



115. Length of seconds pendulum for sea level and different latitudes . .104 



116. Determinations of the length of the seconds pendulum 105 



