rent.

Electro-magnetism. Magnetism which is created by an electric current.

Electrometer. An instrument for measuring static electricity,
differing from a galvanometer, which measures a
current in a wire that acts on the magnetic needle
of the galvanometer.

Electro-motive Voltage, which is the measure or unit of e. m. f.
Force. (E. M. F.)

Electroscope. A device for indicating not only the
presence of electricity, but whether it is positive
or negative.

Electro-static Surfaces separated by a dielectric for opposite
Accumulator. charging of the surface.

Element. In electricity a form of matter, as, for instance,
gold, or silver, that has no other matter or
compound. Original elements cannot be separated,
because they are not made up of two or more elements,
like brass, for instance.

Excessive Charge. A storage battery charged at too high a rate.

Excessive Discharge. A storage battery discharged at too high a rate.

Excessive Overcharge. Charging for too long a time.

Exciter. A generator, either a dynamo or a battery, for
exciting the field of a dynamo.

Exhaustive Discharge. An excessive over-discharge of an accumulator.

F. The sign used to indicate the heat term Fahrenheit.

Fall of Voltage. The difference between the initial and the final
voltage in a current.

Field. The space or region near a magnet or charged wire.
Also the electro-magnets in a dynamo or motor.

Flow. The volume of a current going through a conductor.

Force, Electro-magnetic. The pull developed by an electro-magnet.

Frictional A current produced by rubbing dissimilar
Electricity. substances together.

Full Load. The greatest load a battery, accumulator or dynamo
will sustain.

Galvanic. Pertaining to the electro-chemical relations of
metals toward each other.

Galvanizing. The art of coating one metal with another, such,
for instance, as immersing iron in molten zinc.

Galvanometry. An instrument having a permanently magnetized needle,
which is influenced by a coil or a wire in close