170 



Sir W. Siemens. 



[Apr. 26 r 



Table II. 



Length of wire 102 centims. Diameter 0'76 millim. 

 Current increasing. 



LCH ll-t c ui 



the 



Amperes. 



Tolts. 



Watts. 



Ohms. 



Corre 



■f"P!Tl T^PTfl I'll VP 

 LCJLLIJJC L Cull iXL C 





63-5° F. 







2-565 







•895 



2-295 



•3489 





Just warm. 



„ 



3-217 



1 -340 



4-310 



•4165 









6-36 



3 -204 



20 -377 



•5037 



120° 



Hot. 



i " 



3-511 



5 -146 



43 -798 



•6046 



250 







10 -714 



7-599 



81 -416 



•7029 



420 



Chars cotton. 



! 66 



13 -192 



11 -026 



145 -45 



•8358 



645 



Discolouring. 





13 -698 



11 -927 



163 -38 



•8707 



690 



Dark red. 





15 595 



14 -602 



227 -72 



•9363 



816 



Light red. 



'< 67 : 



16 -222 



15 -510 



251 -60 



•9561 



852 



Bright red. 



! „ 



17 -869 



19 -072 



340 "02 



1 -0698 



960 



Yellow. 



1 " 



25 -094 



29-80 



747 -86 



1 -1875 



1260 



White. 



Note. — The temperatures corresponding to the yery small currents are not 

 given, as for yery small deflections the electro-dynamometer readings could not be- 

 regarded as perfectly trustworthy. 



Table III. 



Length of wire 102 centims. Diameter 0'76 millim. 

 Current increasing. 



Temp, 

 of 

 the 

 room. 



Amperes. 



Tolts. 



Watts. 



Ohms. 



Corre- 

 sponding 

 tempera- 

 ture 

 of wire. 





60° F. 



2-744 



•908 



2-491 



•3309 





Just warm. 





3-629 



1-483 



5 382 



•4086 







35 



6-79 



3-278 



22-258 



•4827 



125° 



Hot. 



J J 



8-995 



5-364 



48-251 



•5963 



270 



Nearly chars 















cotton. 



}) 



11 -072 



7-465 



82 -653 



•6742 



430 



Chars cotton. 



„ 



14 -048 



11-925 



167 -52 



•8489 



700 



Dark red. 



70° 



16 -247 



15 -496 



251 -76 



•9538 



855 



Light red. 





19 -299 



19-97 



385 -40 



1 -0348 



1005 



Bright red. 





20 -073 



20-577 



413 -04 



1 -0251 



1037 



Very bright red. 



l 



22 -948 



25 -643 



588-45 



1-1175 



1164 



Yellow. 





23 -634 



26-25 



620 -40 



1 -1107 



1185 



Bright yellow. 





25-171 



28-31 



712 -59 



1 -1247 



1240 



White. * 





26-190 



29-80 



780 -46 



1 -1379 



1272 



5> 



