developement of magnetic al properties in steel and iron , &c, 207 
No. XIII. 
Another wire exactly similar to the last in size , quality, and 
temper. 
b. Compound process. 
5 blows on this process, through the medium of I ii, (both 
the bars I i and I ii having been previously hammered 
to the same extent as before ) produced a lifting power 
of 246 + 19 = 265 grains. 
THIRD SERIES, 
for determining the effect of larger iron bars. 
In place of the rod Ii , a large bar of iron (Iiv) was substituted . 
Its length was 8 feet, and its diameter 1^ inches. The rest of 
the apparatus ( rods I ii and I iii ) was the same as before. 
No. XIV. 
CJuly 14, &C.3 
Wire S t i being 5 inches in length, %th in diameter, and 164 
grains in weight * which, with the former apparatus, was made 
to lift 345 grains. £See Experiments II. III. and IV. 
a. Simple process. 
Though the magnetism of this wire was nearly destroyed 
before this experiment, a few smart blows on I iv, gave 
it a ready lifting power of 326 grains. 
* The weight of this wire was originally 167 grains ; but it was reduced 3 grains 
by occasionally filing the end. 
