252 Electro-Magnetic Apparatus and Experimenis. 
Arr. V.—Magneto-E lectric and Electro-Magnetic Apparatus 
and Eegieat bys Cuares G. Pace, M. D., Weshingtan 
City. 
es Sbtataed from magnetic electrical instruments where the 
galvanic battery i is used as a source of the magnetic power, the 
hope has been entertained by many, that such instruments, would 
prove valuable in a high degree as sources of electrolytic power. 
The present infantile state of the science, shows clearly the fu- 
tility of such a hope, and points directly to an arrangement which 
will place in the hands of the operator an instrument surpassing 
“ entirely the great galvanic. battery i in value and power. ‘Such an 
instrument is the magneto-electric machine. The instrument 
described in the last April* number of this Journal demonstrates, ~ 
by cateful experiment with Faraday’s volta-electrometer, that 
the. electrolytic power of the current from the combined arma- 
tures is just double that of one. The avenue, then, to an jnde- 
finite power, is too obvious to escape notice. Increase the num- 
ber of pairs of magnets, extend the series of armatures upon the 
same shaft, or in any way in which they. may be brought to bear 
on the same terminal pole, and I hazard nothing i in the assertion, 
that for the same prime cord, and contained. in the same space, a 
magneto-electric instrument can be made of equal, power to a 
galvanic battery of one thousand pairs of plates. It is evident, 
that there will not ‘be that rapid. diminution with the extension 
of the series which obtains in the _ galvanic arrangement, for in 
the magneto-electric machine the whole route of the current is 
through solid conductors, and in the galvanic battery, through a 
great extent of liquid and numerous soldered and imperfect joints. 
Nothing but the want of means has restrained me from erecting 
a magneto-electric machine, which J feel confident would rival 
the largest galvanic battery in existence. The arch of light 
would be obtained by disposing one set of armatures at right 
angles to the other, so that while one gavea diminishing cur- 
rent, the other would afford a current. increasing in the same 
ee while one set was in the neutral _ the other would 
be at the point of strongest action. 
“ 
* Vol. xxx1v, p. 163. 
a or the sparks, and the extreme intensity ie 
