in a circuit.

Diaphragm. A plate in a telephone, which, in the receiver, is
in the magnetic field of a magnet, and in a
transmitter carries the light contact points.

Dielectric. A non-conductor for an electric current, but through
which electro-static induction will take place.
For example: glass and rubber are dielectrics.

Discharge. The current flowing from an accumulator.

Disintegration. The breaking up of the plate or active material.

Disruptive. A static discharge passing through a dielectric.

Duplex Wire. A pair of wires usually twisted together and
insulated from each other to form the conducting
circuit of a system.

Dynamic Electricity. The term applied to a current flowing through
a wire.

Dynamo. An apparatus, consisting of core and field magnets,
which, when the core is turned, will develop a
current of electricity.

Earth Returns. Instead of using two wires to carry a circuit,
the earth is used for what is called the _return_
circuit.

Efficiency. The total electrical energy produced, in which that
wasted, as well as that used, is calculated.

Elasticity. That property of any matter which, after a stress,
will cause the substance to return to its original
form or condition. Electricity has elasticity,
which is utilized in condensers, as an instance.

Electricity, Lightning, and, in short, any current or electrical
Atmospheric. impulse, like wireless telegraphic waves, is called
_atmospheric_.

Electricity, Electricity with a low potentiality and large current
Voltaic. density.

Electrification. The process of imparting a charge of electricity
to any body.

Electro-chemistry. The study of which treats of electric and chemical
forces, such as electric plating, electric fusing,
electrolysis, and the like.

Electrode. The terminals of a battery, or of any circuit; as,
for instance, an arc light.

Electrolyte. Any material which is capable of being decomposed
by an electric cur