Ft . ag 
2 * eye ae 
- On Electro-magnetism as a Moving Power. (845 
7. Various kinds of cut-off (which i is the most critical ae ims 
portant point in the construction of the engine) were tried. , 
he operation of closed circuits and secondary currents was 
a by a number of experiments, requiring great care and ac- 
Facy. 
a The best working velocity of this engine, aid its absolute ‘ 
power with a given battery, was fully tested 
0. The ratio baci increase of power, vith an iticrease in the 
rapreg, Sie the c 
he a ti of different binds of metal i in forming the cut-off. 
12. Various mechanical points of construction, supposed to” 
have been — with the exhibition of; this power, were 
put to a practical tes 
_ Various other’ minor points also — the subject of experiment, 
which will be communicated herea 
- A-second model, of small size te somewhat rude cotistruc- 
tion, was also. made, with a view of ate a new prrengcgiees 
of the axial bars 
Experiments were then commenced upon a 1 larger scale; with: a 
view ‘to determine whether ‘the same proportion of pawer oe 
obtained from large as from small engines, this being the 
ce een in: view: at the time of the ao of the ih 
a 
d by the most flattering results. 
- sn Sat Vol. X, No. 30—Nov., 1850. 44 
