CONTENTS. 



47« 



48. 



49. 



50. 



51- 



52- 



53- 



54- 



55- 



56. 



57- 



58. 



59- 

 60. 



61. 



62. 



63- 

 64. 



65- 

 66. 

 67. 

 68. 

 69. 

 70. 



71- 

 72. 



73- 

 74- 



75- 

 76. 



77- 



78. 



79- 

 80. 

 81. 

 82. 



83- 

 84. 



85- 

 86. 

 87. 

 88. 

 89. 

 90. 

 91. 

 92. 

 93- 



, Variation of the moduli of rigidity with the temperature 

 Young's modulus ...... 



Compressibility of the more important solid elements 

 Hardness ....... 



Relative hardness of the elements 

 Poisson's ratio ...... 



Elastic moduli of crystals, formulae 



'* " " " numerical results 



Compressibility of O, air, N, H at different pressures and temperatures 

 " " ethylene " " " " 



(( (1 <( (( i( « u 



" " carbon dioxide at " " " 



" " gases, values of a . 



" " air and oxygen between 18° and 22°C 



Relation between pressure, temperature and volume of sulphur dioxide 



" " " «' '• " " ammonia 

 Compressibility of liquids 



Specific gravities corresponding to the Beaume scale 

 Densities of the solid and liquid elements . 



" " various woods . 



" " " solids . 



" " " alloys . 



" " " liquids . 



" " " gases . 



" " " aqueous solutions of salts, bases and acids 



Density of water between 0° and 36° C . . . . 

 Volume of water at temperatures between 0° and 36° C in terms of its 



volume at the temperature of maximum density . . . . 

 Density and volume of water at different temperatures from -10 to 250° C 

 " " " mercury at " " " -10 " 36o°C 



Specific gravity of aqueous ethyl alcohol 

 Density of aqueous methyl alcohol . . . . 

 Variation of the density of alcohol with the temperature 

 Velocity of sound in solids ...... 



" " " " liquids and gases 

 Musical scales ........ 



Force of gravity at sea level and different latitudes 

 Results of some of the more recent gravity determinations . 

 Value of gravity at some of the U. S. C. and G. Survey stations 

 Length of seconds pendulum for sea level and different latitudes 

 Determinations of the length of the seconds pendulum 

 Miscellaneous data as to the earth and planets . 

 Terrestrial magnetism : secular change of declination 



" " dip or inclination .... 



" " secular change of dip . . * 



" " horizontal intensity 



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lOI 



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 no 

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