List of Illustrations ix 



FIG. PAGE 



26. Simple hydraulic press . . , *; V . V 87 



27. Method of weighing a solid in a liquid . . 89 



28. Hydrometer ... , " ;. - . >: 92 



29. Apparatus for illustrating variations of barometric 



pressure . S ."" . -. ... *. . , if 97 



30. Siphon barometer . .: : . ^V 99 



31. Apparatus for demonstrating Boyle's Law . 102 



32. Centre of gravity of a plane figure . . .109 



33. Positions of varying stability of a thin lath . 112 



34. Expansion of a bar of metal . : - . . . 124 



35. Gravesande's ball and ring . . , . . 126 



36. Unequal expansions of different liquids . . 127 



37. Expansion of a gas . * . . v . 128 



38. S and X pieces for strengthening brickwork . 132 



39. Method of softening capillary tubing . . 137 



40. First stage in making thermometer . . 138 



41. Method of filling thermometer . . . 139 



42. Thermometer after sealing . . . .140 



43. Determination of freezing-point on thermometer 141 



44. Checking boiling-point on thermometer . . 143 



45. Simple mercury gauge for increasing pressure on 



boiling liquid . . . . .144 



46. Boiling water under reduced pressure . 145 



47. Clinical thermometer . . * . . 149 



48. Index of minimum thermometer . . . 150 



49. Index of maximum thermometer . . . 151 



50. Six's maximum and minimum thermometer . 152 



51. Simple form of calorimeter . . . . 169 



52. Determination of latent heat of steam . . 170 



53. Contraction in volume of ice on melting . 174 



54. Determination of specific gravity of air . . 176 



55. Ingenhaus's conductivity apparatus . . 184 



56. Water a poor conductor of heat - .. . 185 



