Comparisons of Mercury and Platinum Thermometers. 17 

 Table V. 

 Platinum Thermometer in Ice. 



Time. 

 May 6. 



Coils. 



Bridge- Wire. 



Temperature -p 

 of Coils. * 0- 



3.45 



C, D, F, H... 



Coil cor. . . . 



= 265 

 +■016 



B.W. Readg. 

 Cal. cor. 

 Zero cor. 



-6-589 

 + 047 

 -•003 



19 94 



Temp, cor. — -004 



258-467 



3.55 



0, D ; G, H... 

 Coil cor. ... 



= 255 

 -•011 



B.W. Eeadg. 

 Cal. cor. 

 Zero cor. 



+3-515 

 -025 



-•003 



19-90 

 Temp, cor.- -006 



258-470 



4.00 



C, D, F, H... 

 Coil cor. ... 



= 265 

 + 016 



B.W. Readg. 

 Cal. cor. 

 Zero cor. 



-6-588 

 +•047 

 -•003 



1990 



Temp, cor.- -007 



258-468 



4.05 



C, J), F 



Coil cor. ... 



= 260 

 + •017 



B.W. Readg. 

 Cal. cor. 

 Zero cor. 



-1-550 

 + •011 

 -•003 



19-91 



Temp, cor. — -005 



258-470 



4.12 



FI, C 

 Coil cor. ... 



= 260 

 -•005 



B.W. Readg. 

 Cal. cor. 

 Zero cor. 



-1-527 

 + ■011 

 -•003 



19-92 

 Temp, cor. — -005 



258-471 



4.20 



FI.D.E.FAH 

 Coil cor. ... 



= 255 

 +•179 



B.W. Readg. 

 Cal. cor. 

 Zero cor. 



+3-323 

 -■024 

 -003 



19-93 

 Temp. cor. — - 005 



258-470 



4.28 



C, D, F 



Coil cor. ... 



= 260 

 + 017 



B.W. Readg. 

 Cal. cor. 

 Zero cor. 



-1-550 

 +■011 

 -•003 



19-94 

 Temp, cor.- -001 



258-471 



4.40 



O, D, F 



Coil cor. ... 



= 260 B.W. Readg. 

 + •017 Cal. cor. 

 j Zero cor. 



-1552 

 + •011 

 -•003 



19-90 

 Temp. cor. — -006 



258467 









Me 





258 469 













In this determination a double-wall vessel wrapped in felt was again used. 



observer measured the resistance of the platinum thermometer 

 in steam, with different combinations of coils and bridge- 

 wire. A time-chart of the barometric pressure served to give 

 the pressure at the instant when the resistance was taken. 

 Usually the observations of the barometric height were taken 

 simultaneously, as nearly as possible, with the resistance of the 

 platinum thermometer, for the variations of the atmospheric 

 pressure seem to take place suddenly, and not uniformly as 

 Phil. Mag. S. 5. Vol. 48. No. 290. July 1899. C 



