Supposed Polarity of Diamagnetic Bodies. 197 
and these would be at their maximum force just before = a 
after the fo or inner stop, for then the copper would be in the 
most intense parts of the magnetic field. ‘The rising neti of 
the copper core for the tm portion of the journey woul produce 
a current in one direction in the experimental helix, the stopping 
of the copper and consequent falling of its current would pro- 
duce in the experimental helix a current contrary to the former ; 
the first instant of motion outwards in the core would produce a 
maximum current in it contrary to its former current, and produc- 
ing in the experimental helix its inductive result, being a current 
the same as the last there produced ; and-then, as the core re- 
stop, would produce a fourth current in the experimental helix, i in 
the same direction as the 
2672. The four currents produced in the experimental helix” “ 
alternate by twos, 7. e. those produced by the falling of the first. 
current in the core and the rising of the second and centrary cur-" 
rent, are in one direction. They occur at the instant before and 
after the stop at the magnet, @. e. from the momentof ‘maximum 
current (in the core) before, to ke moment of maximum current *. ., 
after, the stop; and if that stop is momentary, they exist only fors, 
that moment; and should during that brief time be gathered ap bye: ) 
the commutator. ‘Those produced in the experimental helix dur-.-- * 
ing the falling of the second current in the core and the ri hee rof + 
2 
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whole of the core e journey ; at Pic, by .its change at the maxi 6 
mum moments, the commutator —* tale ae and a on toy ve 
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2673. The motion however of the core is not upiforn-in ve- |. 
locity, and so, sudden in its change of direction, but, as before . SS 
. “Said (2665.), is at a maximum as = velocity in the, middle ee 
ofits pe to eed apireat from the d mt, mggnet ; ‘ 
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_the approadh, -and ve pecker of the core, the.‘ 
4 
at, points yequidistant from: % 
