122 Proceedings of the Boyal Society . 
January 14th, 1876. 
O o 
Nickel. 
Platinum, 
Formula up to t= 272 9 . R.='525 1 + 131. 
Formula R = -34 t + 176. 1 
<v a> 
s-i 
Resistance = °^ ms . 
Resistance =- 
ohms 
Ep 
1000 
1000 ’ 
Observed. 
| Calculated. 
Difference. 
Observed. 
Calculated. 
Difference. 
+ 
— 
+ 
— 
53 
159 
159 
• • • 
• • • 
192 
194 
... 
2 
69 
168 
167 
1 
200 
199 
1 
... 
99 
183 
183 
... 
... 
210 
210 
... 
• • • 
132 
200 
200 
• • • 
• • • 
221 
221 
... 
• • • 
162 
215 
216 
• • • 
1 
230 
231 
... 
1 
194 
233 
233 
• . . 
... 
242 
242 
... 
• • • 
218 
247 
245 
2 
... 
250 
250 
• • • 
• • • 
247 
265 
261 
4 
• . • 
260 
260 
... 
• • . 
Formula above 1 
= 272°. 
R 
= *775 t + 64. 
279 
285 
280 
5 
... 
271 
271 
• • • 
... 
307 
305 
302 
3 
• • • 
281 
280 
1 
• • • 
345 
331 
331 
• • • 
• • • 
293 
293 
... 
• • • 
376 
354 
355 
• • • 
1 
303 
304 
• • • 
1 
440 
401 
405 
... 
4 
323 
326 
... 
3 
January 18 th, 1876. 
Nickel. 
Platinum. 
O .4 
P 
Formula up to t = 306°. R = '58 1 + 133. 
Formula R = '326 t + 187. 
Resistance = 
ohms - 7 - 1000 . 
Observed. 
Calculated. 
Difference. 
Observed. 
Calculated. 
Difference. 
102 
194 
192 
+ 
2 
• • • 
219 
220 
+ 
1 
136 
212 
212 
• • • 
• • • 
230 
231 
... 
1 
169 
230 
231 
• • . 
1 
242 
242 
• • • 
• • • 
229 
266 
266 
• • • 
• • • 
262 
262 
• • • 
... 
301 
312 
308 
4 
... 
285 
285 
... 
. . . 
Formula above t = 306°. 
R 
= -775 1 + 74. 
363 
356 
355 
1 
... 
305 
305 
• • • 
• • • 
407 
386 
389 
• • • 
3 
319 
320 
• • • 
1 
447 
420 
420 
• • • 
... 
333 
333 
... 
• • • 
502 
466 
463 
3 
• • • 
348 
351 
... 
3 
An attempt was made to discover whether or not the conductivity 
curve had another peculiar point corresponding to that in the 
