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170
THE ELECTRIC LIGHT.
strument wrought only by mechanical motion. The moment we give motion to this soft iron in front of the magnet, we get a spark. It is true in this apparatus it is very small, but it is sufficient for you to judge of its character. It
Fig. 59.
is the magneto-electric light, and an instrument has been constructed as there shown (fig. 59) which represents a number of magnets placed radially upon a wheel—three wheels of magnets
