Duplex Wire. An insulated conductor having two distinct wires twisted or laid together, but properly insulated from each other.
Dynamic Electricity. Electricity in motion or flowing, as distinguished from static or frictional electricity.
Electricity of relatively low potential or electro-motive force in large quantity or amperage.
Dynamo. An apparatus consisting of a core and field-magnets, properly wound with insulated wire, which, when put into operation by revolving the core or armature at high speed, develops electric current; a mechanical generator of electricity.
Dynamo, Motor. (See [Motor-dynamo].)
E
Earth. The accidental grounding of a circuit is termed an “earth.”
Earth-plate. A plate buried in the ground to receive the ends of telegraph lines and other circuits, and so give a ground connection. Copper plates are often used, but in houses the ground is usually formed by attaching a wire to the gas or water pipes.
Earth Return. The grounding of a wire in a circuit at both ends gives the circuit an earth return. This method is commonly used in telegraph lines, both in the wire and wireless systems.
Eddy Currents. (See [Currents, Eddy].)