developement of magnetical properties in steel and iron, &c. 203 
No. III. 
CJuiy 2-] 
Same wire as in the last experiment QS 1 1]. 
a. Simple process After repeatedly hammering this wire 
upon the bar I i, it now lifted 246 grains ; but its power could 
not be farther increased. 
b. Compound process. The lifting power, by often ham- 
mering, was now raised to 326 + 19 = 345 grains. 
No. IV. 
[July 10.] 
Wire S t\, the same as in the last experiment. 
The compound process was, on this occasion, continued 
for a length of time, the bars I i and I iii being repeatedly 
hammered together, but no additional lifting power could be 
obtained. 
No. V. 
CJuly 10.3 
Larger wire, S u i i ; length, 12 inches ; diameter, \th of an inch. 
This wire being hammered in its untempered state, with 
20 or 30 smart blows, by the simple process, only lifted 71- 
grains. 
No. VI. 
The same wire as in the last experiment, tempered by heating to 
redness. [S t i i. J 
a. Simple process. 
By 2 smart blows, with a small hammer, it 
now lifted 
37 grams. 
