PROFESSOE TYNDALL ON THE DIAMAGNETIC FORCE, ETC, 19 
Table VI. 
Bar of compressed carbonate of iron, 
length 0*95 of an inch, 
width 0'17 of an inch, 
depth 0*23 of an inch. 
Set equatorial between the excited poles. 
Strength of current. 
Attraction. 
74 
742 
135 
1332 
179 
180" 
214 
218" 
249 
248" 
277 
280" 
341 
330" 
381 
353" 
It is needless to remark upon the perfect similarity of deportment here exhibited 
to the cases previously recorded. 
In the following instances the same law of increase is observable. 
Table VII. 
Sulphate of iron. No. 1. 
length 0*75 of an inch, 
width 0*22 of an inch, 
depth 0'27 of an inch. 
Set axial between the excited poles. 
Strength of current. 
Attraction. 
71 
70" 
132 
CO 
CO 
217 
220" 
280 
275 " 
328 
333" 
359 
348" 
Table VIII. 
Sulphate of iron, No, 2. 
length 0*75 of an inch, 
width 0*22 of an inch, 
depth 0*27 of an inch. 
Set equatorial between the excited poles. 
D 2 
