Crossword-Solution: ELECTROMAGNET 13 letters, 3 clues 🏆 scrabble score: 18

The decomposition of water by electrolytic action was recognized and made the basis of communicating at a distance even before the days of the electromagnet.

Callahan's first idea was to distribute gold quotations, and to this end he devised an "indicator." It consisted of two dials mounted separately, each revolved by an electromagnet, so that the desired figures were brought to an aperture in the case enclosing the apparatus, as in the Laws system.

The poles of the electromagnet in the local circuit are hollowed out and filled up with carbon disks or powdered plumbago.

The armature and the carbon-tipped poles of the electromagnet form part of the local circuit; and if the relay is actuated by a weak current the armature will be attracted but feebly.

Over this was placed a circular disk of paper; an electromagnet with the embossing point connected to an arm travelled over the disk; and any signals given through the magnets were embossed on the disk of paper.