induction, which has made all modern electrical enter- The self-exciting Geissler tube is a beautiful object i in’ prises possible. Faraday reasoned, that since the cir- adark room. The eleetrica! effect is produced by the culation of an electric current in a wire coil surround- friction of mercury… … in a _ brass which an arma- attached to the pies of the magnet. The armature | cross piece ture adheres to a | tube is ingeniously contrived to prevent .breakage by magnet. The consists of a cross arm of soft iron wound with four or the falling of the mercury against the end of the tube, five…
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