On the Cutting of Steel by Soft tron. 343 
which the parts of gun Jocks are made, were Sai seninst 
the edge, of the revolving soft iron plate, they were imme- 
diately cut by. it, with a degree of rapidity, which was al- 
ways considerable, but which was greater as the pieces of 
steel were thinner. Pieces as thick as the plate of a com- 
mon joiner’s saw, were cut almost as rapidly, as wood is cut 
by the saw itself. Considered as an experiment, merely, 
commenced upon cold and hard steel, will divide it with so 
much rapidity, as this mode of applying soft iron. Afterall 
itis evident that it is only a peculiar method of cutting red 
mal be shewn, w , ie 
pulse, should, nearly all be concentrated in the steel, and 
€ scarcely perceptible in the iron. Neither is it perfect- 
Pe 
