TABLES 235, 236. 

 COMPARISON OF THERMOMETERS.* 



Chappius gives the following equations for comparing glass thermometers: 



iooo(7V T H )-. 00543 doc r m > y m + 1.412 x IO-HIOO r m *) r m 1.323 x K>- (loo* 



1000 ( Tea, - TU) = -03S9 (>oo - T m ) T m - o. 234 X io- ( 100= - r) 7V - 0.5 u> X io~ (ioo - 

 A^rr nitrogen ; //= hydrogen ; CO^ = carbon dioxide ; m = mercury. 



TABLE 235. Hydrogen Thermometer compared with others. 



This table gives the correction which added to the thermometer reading gives the temperature by the hydrogen 



thermometer. 



TABLE 236. Air Thermometer compared with others. 



This table gives the correction which added to the thermometer reading gives the temperature by the air thermometer. 



* These two tables are taken with some slight alteration from Landolt and Boernstein's " Phys. Chem. Tab.' 

 t P. Chappius, "Trav. et Mem. du Bur. internal, des Poids et Mes." vol. 6, 1888. 

 t Marek, "Zeits. fiir Inst.-K." vol. 10, p. 283. 



Grommach, " Metr. Beitr. heraus. v. d. Kaiser. Norm.-Aich. Comm." 1872. 

 II Wiebe und Bbttcher, " Zeits. fiir Inst. K." vol. 10, p. 233. 

 II White, " Proc. Am. Acad. Sci." vol. 21, p. 45. 



SMITHSONIAN TABLES. 



229 



