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Itjdroffen and its 5'ubstitutes for t]~e Lime-gig]tt.
209 With a cylinder of 2 feet diameter, and 3 feet in length, it is possible to employ at ]east four rows oi' collecting points, each of which will be 30 inches long. A single revolving plate accommodating all equal length of collecting points, would require to be at least 7 feet in diameter. It is evident that the cylinder may be extended in length without adding seriously to its inconvenience.
The form of machine above described may be modified by placing the fixed cylinder and the sectors outside the revolving cylinder, the collecting points being inside the latter, and the conductors carried out at the extremities of the axis, but such an arrangement of parts possesses, i~ is thought, no peculiar advantages.
A machine constructed of revolving discs of paraffined paper or cardboard, instead of the ordinary plate, has been tried by the writer and was found to give excellent results. It would be quite possible to mount upon one axis a considerable number, say 50 p|ates or discs of cardboard properly prepared~ which, with their corresponding
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