COMPARISON OF PLATINUM AND GAS THERMOMETERS. 113 



Therefore the change of resistance between the Ohms. 



platinum temperatures and 99'6398 is . (3-57298 2'57827) = 0*99471 

 And so F.I. (the fundamental interval, i.e., the"! 0-99471 x 100 



> ' 



change between and 100) 99-R398 



Therefore, resistance at 100 :.". . ... . . . . ; . . =3*57658 



We append also the various formulae showing the relations of each of the four 

 quantities T, pt, d, and 8 to the others, viz. : 



/5000 



^ 



VOL. CXCIV. A. O 



