25° Mr. Scoresby Junior’s experiments and observations on the 
steel bar used in the first and second series of experi- 
ments, and weighing about 600 grains, was hammered for 
a considerable time while held vertically upon the poker. 
The greatest effect which I could produce with the large 
hammer, was a deflection of the compass needle, at the 
distance of three inches, of thirteen degrees ; in this state 
it lifted a nail of 63- grains, but refused one of 11 grains 
weight. 
6 . A cast iron bar of the same size and form as the last, 
became capable of lifting a nail of 37 grains weight. After 
it had acquired this power, its magnetism was nearly de- 
stroyed by five blows with the north pole upward. 
The strong magnetising effect of percussion on soft steel, 
induced me to apply the property to the formation of mag- 
nets. For this purpose I procured two bars of soft steel, 
30 inches long and an inch broad ; also six other flat bars of 
soft steel 8 inches long and half an inch broad, and a large 
bar of soft iron. The large steel and iron bars were not 
however absolutely necessary, as common pokers answer 
the purpose very well ; but I was desirous to accelerate the 
process by the use of substances capable of aiding the deve- 
lopement of the magnetical properties in steel. The large 
iron bar was first hammered in a vertical position. It was 
then laid on the ground with its acquired south pole towards 
the south, and upon this end of it the large steel bars were 
rested while they were hammered ; they were also ham- 
mered upon each other. On the summit of one of the large 
steel bars, each of the small bars, held also vertically, was 
