Ayrton He KLlgour. 
Pig. 13. 
VaruotLon, of EmisstviXy mvWv Diameter 
out 300° C. 
PhxL.Trans. 1892 .A .Plate 15. 
iatLorv of Temperature, 
CaLcuLoJ-exL carve connecting 
Sc t for thj& 6 mxL. wire withs 
current of 1- 4 amperes. 
Terrcperoute CentigrarLe 
Wo ft, Njwtmai liAh. 
