The Evolution of Forces

action apatite atoms attraction become black paper calorific cause centimetres CHAPTER chemical classical mechanics consequently conservation of energy dark diamonds dissociation of matter ebonite effects electric waves electroscope elements emitted equilibrium ether existence experiments explain exposed exposure fact fluorite forms of energy glass gravitation Henri Poincaré Hertzian waves illuminating inertia influence infra-red radiations infra-red rays insolation intensity intra-atomic energy invisible phosphorescence invisible radiations invisible rays kilogrammes kilogrammetre kinetic energy lamp lamp-black leucophane lines of force liquid Lucien Poincaré luminous magnet magnitude mechanics metal metres millimetre movement observed obtained opaque bodies particles pass phenomena phenomenon phorescence phos phosphorescent bodies phosphorescent screen photographic plate physicists placed possess principle produced properties quantity quinine radio-active radium researches screen of sulphide sensitive simple solar space spectrum substances sulphide of calcium sulphide of zinc surface temperature tension theory tion transformation transparent tricity ultra-violet universe velocity vibrations wave-length