Oe ae = 
: 
£ etre Magnet ih: Magnelo-E lectric Formuta. sor" 
In those experiments Mr. S chi \weigger employed an electro-mag- 
netic multiplier, eC d of only six brass-wires, one twelfth of 
an inch in thickness, “which we shall designate by AH, A’E’, 
A’E”, &c., and of which each was folded, as shows in the fig. 1, 
the line ABCDE. By means of small grooves filled with mer- 
cury, the extremities of these wires can be placed in commu- 
nication in. two modes, and thus send-the current at will either 
from the first wire AE into the second AYE’; from this into 
the third A”, &c:; or in causing to communicate on one part 
all the extremities A, “AY, AY”, and on the other, the extremities 
E, EK’, E”, through the six wires at once. _In this last disposition, 
when the multiplier forms but one circuit, the current produced 
by the rotation of a magnet, and saitectel to the multiplier by 
‘conductors of a pretty large mass, (thick bands of copper, ) causes 
the needle to deviate instantaneously 80° to 90°, and if the needle 
continues to be turned, stops finally between 50° to 60°, If, the’ 
multiplier remaining the same, two disks of zinc. and. copper, 
wetted with a salirie solution, are used, the constant deviation of 
the needle is but 10° to 15°. 
Fig. 1. “al sy, Fig. 2. Fs ‘OL Pig. 3.2 
An olin multiplier, of which: Mr. ‘Faraday atid’ use, 
. corn poaed of numerous turns, and formed with a wire, thin, and 
very long, folded as shown by fig. 2, (that which, aboording to 
the Journal of Chemistry and Physics, by Mr. Schweigger, 1825, 
Vol. III, is the best form which can be given to it,) produces a 
deviation of only 10° to 15°, by the current of the same magnet 
turning round its axis. By a proper combination of several mag- 
ets turning around their axes, this same multiplier (fig. 2;) 
shows an increase of the electric force, whilst the multiplier, 
‘whieh we described in the ene of this noe, and is destined 
ber ee 2 
> 
* See J. S. C. Schweigger tber Mythologie. Tab. I. Fig. 1. 
