CONTENTS. 7 
Page. 
Chapter IV— Continued. 
Manometer 167 
Metallic capillary tubes 169 
Porcelain air-thermometer bulbs 171 
Machine for soldering porcelain 175 
Revolving muffle 180 
Remarks regarding apparatus and manipulation 185 
Constant volume air thermometer — method of computatiou 188 
. The general equation 188 
The equation simplified 190 
Errors of the approximations 190 
Compensator 192 
Errors of measurement in general 195 
Constant volume air thermometer — experimental results 198 
Earlier results ". 198 
Later results 204 
Digression 206 
Constant pressure air thermometry — apparatus 208 
Constant pressure air thermometry — method of computation .« 210 
The general equation 210 
The equation simplified 211 
Volumetry of bulbs 213 
Errors of the approximations 214 
Compensator 215 
Constant pressure air thermometer — experimental results 216 
Manipulation 216 
Experimental data 217 
Graphic digests 227 
Constant pressure air thermometer — discussion 227 
Errors of measurement, in general 227 
Accuracy of the measurements made, group I 231 
Accuracy of the measurements made, group II 232 
Boiling point of zinc 233 
Coefficient of heat expansion of porcelain 236 
Remarks 237 
Chapter V. — The pyrometric use of the principle of viscosity 239 
Introduction r . 239 
Remarks 239 
Literature 240 
Transpiration subject to the Poiseuille-Meyer law 242 
Apparatus 242 
General disposition of parts 242 
. Apparatus for constant pressure 244 
The capillary apparatus 245 
Differential apparatus 249 
Method of heating 249 
Methods of computation 251 
The general equation 251 
Case of two cold ends, absolute apparatus 252 
Case of two cold ends, differential apparatus 254 
Experimental results 255 
Manipulation 255 
Nomenclature 256 
Data 258 
(661) 
