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It was a chromium affair with a heavy ebonite base—a useful weapon.

To observe this it is best to replace the usual terminals of the coil by two metal columns insulated with a good thickness of ebonite.

This proves that the electrical condition of the excited ebonite and of the excited glass must be different; for had it been the same, the two balls would have repelled one another.

The details of the receiving arrangement are as follows:—The coherer tube consists of an ebonite tube containing hard steel particles of a uniform size, placed in the adjustable space between two polished steel electrodes.

The leaves will diverge, even though the charged ebonite rod does not approach to within a foot of the electroscope.