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Knight's Mechanical Encyclopedia (ed. Knight) 2 0 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), E. (search)
le, the galvanic battery and index are connected with the mercury column by means of insulated points on the tube, so that the index will signal each successive pound of pressure upon the dial, which has corresponding points. The completion of the circuit also sounds an alarm by attracting the armature on the hammer-shaft. E-lec′tric switch. A device for interrupting or dividing one circuit and transferring the current or a part of it to another circuit. See switch. A commutator. See Culley's Handbook of telegraphy, London, 1870, pp. 199-203. E-lec′tric Tel′e-graph. That form of electric signaling apparatus in which an insulated wire excited by frictional electricity is — or rather was — used to convey messages by sparks or shocks. For notices of early observations, see electrical apparatus. Gray, in 1729, experimented with conductors; Nollet soon afterwards sent a shock along a line of men and wires 900 toises in length; Watson, the learned Bishop of Llandaff, in