whose pilents were to be observed and compared. 
: 
*% 2653, “A thin glass tube, of the given size (2643.), 54 by # 
* inches, was filled with a saturated solution of ene of | 
* iron, and employed as the experimental core: the velocity given 
: a to. the macline at this and all average times o experiment was 
+ tion atthe Mvancmmlahs| , A piece of magnetic glass tube (2354.), 
192 Dr. Faraday’s Experimental Researches in Electricity. 
_right or the left occupied from sixteen to twenty seconds. en 
“experimenting with such bodies as bismuth or phosphorus, the 
place of the needle was observed through a lens. ‘he perfect 
communication in all parts of the circuit was continually ascer- 
tained by a feeble thermo-electric pair, warmed by the fingers. 
This was done also for every position of the commutator, where 
the film of oxyd formed on any part by two or three days’ rest 
was quite sufficient to intercept a feeble current. 
2652. In order to’ bring the phenomena afforded by magnetic 
and diamagnetic bodies into direct relation, I have not so much 
“noted the currents*produced in the experimental helix, as the ef- 
fects obtained at the galvanometer. It is to be understood, that 
the standard of deviation, as to direction, has always been that 
—— by an iron wire moving in the same direction at the ex- 
mental helix, and with the same condition of the commuta- 
tor Nand connecting wires, as the piece of bismuth or other body 
Sag as to ‘cause five or six approaches and withdrawals of the 
“core in 6ne second ; yet thé solution produced no sensible indica- 
a a ger. of foolscap paper, magnetic between the poles of the 
net, were equally inefficient. A tube filled with small 
F renioxs phate of iron caused the needle to move about 
rie 
farge eaeten 
, 2954. Whenever the needle moved, it was consistent in its dir 
pects the, ane of a magnetic me , but in, many cases, tpl 
Washi nove. This . 
