116° Scientific Intelligence. 
every additional impulse. It will thus be seen that the only limit 
rma- 
it takes off very powerful currents generated in its wire by the in- 
creased magnetism, does not at all interfere with the primary cur- 
rent of the electro-magnet. 
e machine now at the Paris Exhibition measures about 24 in. 
in length, 12 in. in width, and stands 7 in. high; but this being 
aiiubtbotly constructed as to its proportions, the results obtained 
are, no doubt, much less than they would be with a Lea? phd con- 
_ the best effect in the second armature. 
ee 
platinum 
wire, ‘01 in. in diameter, incandescent, and when a small volta- 
meter was placed in circuit with the second armature it would give 
off 250 cubic centimeters of gas per minute, and in connection 
with an electric regulator would give a light equal to about thirty- 
ve Grove’s or Bunsen’s elements, the driving power expended 
being less than one horse. 
I have now to describe a machine on the same principle as that 
this pening 
quired for the armature, enabling us to take full advantage of the 
horse-shoe form of electro-magnet. The shoes of the electro-mag- 
net and armatures are so proportioned to each other that there is 
an actual break in the magnetic circuit with reference to each 
rent given off by the exciting armature may at the precise Mo 
ment exert its fu 
which the right — an image of one picture, and the left eye 
er. These images ought to be apparently in the same 
distin! vision ori 
