Properties of some Liquid Metals. 407 



tion observations a somewhat different equation was obtained, 

 viz. : — 



E.M.F. (in volts) x 10 5 = 0-1463 * + 0-001238 * 2 ; 



Fig. 7. — Copper-Lead Thermoelement. 



400 



300 350 



Temperature C. 



but as the calibration curve was not exactly a parabola the 

 upper equation was judged the better. 



The junctions and standard copper wires were insulated as 



450 



