Xll TABLE OF CONTENTS. 



225. Coefficients of cubical expansion of gases .218 



226. Dynamical equivalent of the thermal unit 210 



227. " " " " " historical table . 220 



228. Specific heat of water, descriptive introduction 222 



228. Specific heat of water . .222 



229. Ratio of specific heats of air, various determinations 223 



230. Specific heats of gases and vapors . 224 



231. Vapor pressure of ethyl alcohol 22 e 



232. " " " methyl " 225 



233. Vapor pressures and temperatures of various liquids : 



(a) Carbon disulphide .226 



() Chlorobenzene .- .226 



(^) Bromobenzene . 226 



(</) Aniline 226 



(e) Methyl salicylate k 227 



(/) Bromonaphthaline 227 



(g) Mercury 22? 



234. Thermometers, comparisons of mercury in glass and air thermometers 228 

 235- comparison of various kinds with hydrogen thermometer 229 



236. " " " " " air thermometer . . 229 



237. change of zero due to heating (Jena glass) 230 



238. " " " " " " " (various kinds of glass) . 230 



239. " " " " " " " effect of composition of 



glass 231 



240. slow change of zero with time 231 



241. correction for mercury in stem 232 



242. Emissivity of polished and blackened surfaces in air at ordinary pres- 



sures 234 



243. Emissivity of polished and blackened surfaces in air at different pres- 



sures 234 



244. Constants of emissivity from various substances to vacuum .... 235 



245. Effect of absolute temperature of surface on the emissivity, constants 



of bright and blackened platinum wire 235 



246. Radiation of bright platinum wire to copper envelope across air of dif- 



ferent pressures 236 



247. Effect of pressure on radiation at different temperatures 236 



248. Properties and constants of saturated steam, metric measure .... 237 



249. " " " " " British measure .... 238 



250. Ratio of the electrostatic to the electromagnetic unit of electricity, dif- 



ferent determinations of 243 



251. Dielectric strength : 



(a) Medium air and terminals flat plates < . 244 



(b) " " " " balls of different diameter .... 244 



(c) balls comparison of the results of dif- 



ferent observers 244 



252. Dielectric strength of gases, effect of pressure on 245 



253. " " "- various substances 245 



