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344 On Electro-magnetism as a Moving Power.’ 
be partly drawn ont of the helix by the hand, it goes back with 
a spring when the hand lets go its hold. This power—the 
action of the helix upon the metallic bar within it,—is the power 
used in his engine. ‘The power, when a single coil is used, has 
its points of greatest and weakest force, and in this condition is 
objectionable« But by making the coil to consist of a series of 
short independent helices, which are.to be brought in action suc- 
cessively, the metallic rod is made to pass through the coil ~ 
back again with great eee ty and an equable motion. In all t 
engines hitherto used, t ere isa loss of power at the instant of i 
_ change of current, owing to the production of a secondary current 
_Moving in the opposite direction, and to this loss is owing the fact 
that these engines cannot be rendered available. Prof. Page had 
in view the obviating of this difficulty when he commenced his 
“recent investigations, and has: full success in his new invention. 
The report below, is an outline only of his experiments on:the 
appiration, of Electro-magnetism, and is dated, Aug. 3d, 1850. 
er atte aaa from the National Intelligenodt of Sepien 
r Ans Hi 
Fadi i ive brief time-allowed, it seill be imppentila for. me aig 
"more in’ Anis respect than to give an outline of the experim 
which I have repeated and recorded during the past year. heir — 
full detail and sabi esi will form a volume, replete 1 with inter : 
esting sc matter, and require much time and lab 
e firs pene experiments ‘were made with a sual iad 
emulate, build expressly | for the purpose, and with the utmost care 
n reference ‘to’ mec rical accuracy. ; Attached to this. was a dy- 
nanometer of new onstruction, and: ‘admirably. adapted to- the 
gine, at any given velocity—a great desideratum..in a, 
this new power. With this trial engine the Sollevei eT 
questions were tested : a : 
1, The dynamic values of different quadisies of; soft iron. a 4 
2. The dynamic values of steel, hard and soft: » - 3 
3. The dynamic value of cast iron 
The statical values of all these variéljes were tested by: a sepa- 
rate apparatus, constructed for the purpose, called the axial galva-_ 
nometer. ‘Twelve .warieties in all were tested, and were in bars of — 
uniform size, one foot-in length, and one inch in diameter, and it, 
was found that the statical and dynamic properties corresponded.” 
€ proportions of the helices were approximately tested, 
though much remains unsettled yet upon this important poe: 
5. The advantages of keeping up the magnetism in 2 axial 
bar was coast satisfactorily tested. 
6. Various modes were tried of —- saat motion of the 
engine, and with success 
ge 
