RESEARCHES IN MAGNETISM. 
597 
Soft Annealed Iron Wire in Earth’s Vertical Field, Plate 62, fig. 37. 
Load. 
Magnetometer. 
0 
159 
(initial) 
1 
220 
Sudden rise of magnetism by first application of load. 
(first application) 
0 
218 
1 
222 
0 
2201 
Here on gives rise and off gives fall of magnetism. 
1 
224 
0 
222 
1 
2251 
2 
247 
Note here the sudden rise of magnetism caused by this exten- 
1 
248 
sion in the range of loading. 
0 
248 
1 
248 
2 
248 
3 
249 
2 
251 
1 
253 
0 
254 
- ; 
1 
253f 
Here we have distinctly reached the condition in which off 
2 
252 
gives rise and on gives fall of magnetism. 
3 
2501 
2 
252 
1 
254 
0 
2551 
1 
255 
2 
253 
3 
2511 
3 
246 
After tapping the wire. 
2 
2481 
Without tapping. 
2 
275 
After tapping. 
1 
277 
Without tapping. 
1 
299 
After tapping. 
0 
301 
Without tapping f This shows well how hysteresis leaves 
0 
281 
After tapping < the value of the magnetism for zero 
* 
{_ load abnormally raised. 
1 
284 
Without tapping. 
1 
295 
After tapping. 
2 
293 
Without tapping. 
2 
289 
After tapping. 
3 
286 
Without tapping. 
3 
272 
After tapping. 
2 
275 
Without tapping. 
2 
286 
After tapping. 
1 
289 
Without tapping. 
1 
304 
After tapping. 
0 
306 
Without tapping. 
0 
279 
After tapping. 
3 
281 
Without tapping. 
0 
287 
55 55 
3 
281 
5 5 55 
0 
287 
5 5 5 5 
* Up to this point these observations are plotted in Plate 62, fig. 37. The remaining operations 
have heen omitted from the figure to avoid confusing it. The dotted curve showing a maximum at 
about J kilo, is a curve drawn through the points reached by tapping. The tapping was not violent, in 
order that the soft wire should be kept from injury, and for that reason the succeeding on and final oft 
curves with tapping do not nearly coincide. 
MDCCCLXXXY. 4 H 
