94 A. M. Mayer—LEffects of Magnetization 
toward the plane glass. 
The examination of the experiments of the first and second 
series contained under the heading, “On gradually increasing 
the resistance,” makes known a remarkable phenomenon 
these experiments the current, with its maximum strength, was 
first passed through the helix and then it was gradually brought 
down to its minimum strength by sliding the copper a 
wire over the fine wire of german-silver until the whole lengt 
of the latter was brought into the circuit. At the moment of 
sending the current with its maximum strength, the rod elong- 
ated 1°3 divisions of the scale; but if we now keep the circuit 
closed, but gradually diminish the strength of the current, we 
observe that the scale-readings do not correspond to those given 
when the corresponding strengths of current were reached b 
going from their mimimum to their maximum, as the following 
tables, giving the differences of scale-readings in the two cases, 
plainly show. 
First series of experiments. 
Fraction of length of fine interpolar wire, 1 § 4 + - 0 
Ongraduallydiminishingthecurrent, 55°5 55°6 55°8 55°9 55°95 56:1 
“~~ jnereasing the current, 54°85 54°9 55-0 55°2 55°6 561 
Differences, Th 5 hese Bo ei 
Second series of experiments. 
Fraction of length of interpolar wire, 1 g + + : 0 
On gradually diminishing the current, 55°25 55°4 55°65 55°8 55°9 561 
On gradually increasing the current, 54°8 54°8 54°85 55-0 55-4 561 
Differences, 0 SG i See 
breaking the circuit the rod instantly retracts 45 of a division 
in the second series of experiments and 65 of a division in the 
