‘370 Mr. 8. G. Laws on the Thomson Effect 
The discrepancy between the two results may very well 
be attributed to some slight difference of composition, for 
Riecke gives the value +24°5x10-® calories for commercial 
bismuth, and for pure bismuth —10:2x10-® calories*. 
Moreover, Le Roux + in his comparative results obtains the 
same values for bismuth and iron, whilst Batelli finds for 
iron the value —1130 ergs f. 
VI. Heperiments with Alloy No. 1. 
This alloy was found on analysis to contain 1°23 per cent. 
tin. 
Mean diameter of rods = 4:972 mm. 
Mean resistance of rods = 0:00019 ohm per mm. 
Some observations taken, from which the value o== — 14300 
is calculated, are shown in Tables III. and IV. “44 
Taste I1I.—Thomson Effect. 













C = 3 amperes. t= 9 Snicms.) 0 —WaeAr: 
t,=99 ,, ig 0:66 degree per mm. 
dx 
15h a Or ae 6. 
3°45 +233 
4°27 —858 10°8 
59 +2°02 
5°46 —8:58 10°6 
6°26 +1-96 
TA —847 10°6 
8:16 4+2°44 
8°52 —8:30 10-4 
9°31 +174 
Mean value ford... 106 
Correction... 0°0 
Open? LOG 
Taste [V.—Joule Effect. 
C = 1°6 amperes. 2, = 9°85 ems. a“, ='9'9) ems. 
Ha) pagel! |) lap painaelne 8: 
SOD | | ee 
4:24  —4-96 | 9:04 
S19 97) +3:50 
Oe Tee | 9°31 
a Mel +4:60 
ot) a: k=) 8-90 
| +3°56 




Mean value for 6, ... 9°08. 

+ Le Roux, loc. cit. p. 277. 
t Batelli, loc. ct. p. 548. 

) 
+ 
{ 
9 
4 
i 
i ane i -— c 
