Xll CONTENTS 



205. Vapor pressure of solutions of salts in water 230 



206. Pressure of saturated aqueous vapor over ice, low temperatures . . 232 



207. " water, low temperatures. 232 



208. " " " " " " " o° to 374 C . . 232 



209. Weight in grams of a cubic meter of saturated aqueous vapor . . . 234 



210. " " grains " " " foot " " " "... 234 



211. Pressure of aqueous vapor in the atmosphere: Various altitudes . 234 



212. " " " " " " " Sea-level .... 235 



213. Relative humidity, vapor pressure and dry temperature 236 



214. wet and dry thermometers 238 



Thermometry 



215. The international temperature scale 239 



216. Recommended procedure for calibration 241 



217. The standard platinum resistance, thermometer 242 



218. The standard thermocouple 243 



219. Secondary calibration points 243 



220. Directions for use of standard thermoelement calibrations .... 244 



221. Standard calibration curve for Pt-PtRh (10% Rh) thermoelement . 245 



222. " " Cu-constantan thermoelement . . . 245 



223. " " " " " " " below 0° C 246 



224. Melting points of some purified salts, 400 to 1 300 C 246 



225. Standard calibration curve for chromel-alumel thermoelement . . 247 



226. Optical pyrometry 248 



227. Correction for temperature of mercurial thermometer thread . . . 249 



228. Stem correction' for centigrade thermometers 249 



229. Reduction of gas thermometers to thermodynamic scale 249 



230. Practical thermoelectric scales (comparisons) 250 



231. Temperature differences between I. T. S. and various older scales . 251 



232. Conversion factors for units of work 251 



233. English and American horsepower at various altitudes and latitudes. 251 



234. Nonflammable liquids for cryostats 251 



Melting and Boiling Points 



235. Melting and boiling points of the chemical elements 252 



236. Effect of pressure ori melting point 253 



237. " freezing point of water 253 



238. " boiling point 253 



239. Densities and melting and boiling points of inorganic compounds . 254 



240. " " " " " " " organic " . 256 



(a) Paraffin series 256 



(b) Olefines or the ethylene series 256 



(c) Acetylene series 257 



