I) Titles.- Two-phase System; Single-phase System, Three-phase Sys-

turn; Poly-phase Systum.

1. An a.C. Distributing system employing a single

phase at a.c. supplied by the generator;

An a.c. distributing system utilizing a number

of alternating currents differing in qhasc;

^{An a.c. system employing three alternating cur-}

An a.c. system employing two alternating cur-

rents of equal somgth, differing in phase by a quancr cycle, or such that one current has maximum strength when the other is passing through zero.

2. Titles. Electric Current; Direct Currant; Alternating Current; Con-

tinuous Current.

1. A currant which always flows in one and the

same direction;

2. A flow of passage of electricity along an elec-

tric circuit, usually measured in amperes;

3. A current which periodically alternates or m- vcmcs in direction;

4. A current uniform both in socngth and in di-

rection. A steady direct current.

2. Titles.- Circuit Breaker; Controller; Control Power Switch; Line Switch.

1. A disconnecting or isolating switch in an a.c. or

d.c. circuit;

2. A switch used for connecting or disconnecting

the source or control power to and from the correct bus or equipment;

3. A device for conoolling an clecoic machine or

a circuit (a conoolling device);

4. A device for ^opening or closing a circuit either

by hand or automatically, in the case of an overload.

2. Titles.' Voltage Balance Relay; Emergency Direct Current Relay; Cur- rant Balance Relay; Impedance Relay.

l. A relay which functions when the circuit im-

pedance increases or decreases to pre- determined value;

2. A relay which operates on a difference in cur-

rent output or output of two circuits;

3. A device used to interrupt a direct-current

power circuit under emergency conditions;

4. A relay which operates on a difference of volt-

age between two circuits.

5. Titles.' Electric Motor; Synchronous Motor; Asynchronous Motor; In- duction Motor.

An a.c. motor in which the rotation takes placu

in synchronism with the rotating element of the gcncmtor supplying the operating current;

^{A machine for aansforming electric power into}

utillzablc mcchapical power;

^{An a.c. motor in which the rotation is not syn-}

chronous with the rotating element of the gen- erator supplying the driving current;

4. An asynchronous a.c. motor in which the cur-

rent flowing in the ,winding of the secondary

winding is induced clccoomagnctically by the

current finding in the primary one.

5. Titles.- Control Power T; Air-blast T; Oil-cooled T.

1. A T which is cooled, when operating, by a flow

of oil through its framework;

2. A T which is cooled, when operating, by a blast

of air delivered through its framework;

3. A T which serves as the source for a.c. connol

power for operating a.c. devices.

7. Titles.- Feeder; Commutator; Converter.

I . A machine which operates by means of a ro-

tating commutator to convert a.c. into d.c. for

disnibution;

2. In an electric disnibuting system, a supply con-

ductor carrying current from a power-house to main conductor, and not itself connected to motom, lamps, or translating devices;

3. A device for changing the direction of a cur-

7. Titles.- Series Generator; Shunt Generator; Turbo-alternator; Com-

pound Motor.

1. A machine which generates an electric current

(usually a dynamo electric generator, both a shunt winding and a series winding are on its field magnets);

2. A machine consisting of an a.c. generator

mounted upon the shaft of a steam turbine;

3. A generator whose field-magnet winding is

connected in series witii or in succession to its

4. A generator whose field-magnet winding is

connected in shunt to, or in parallel with its ar-

9) titles: Conduction; Conductor; Conductivity; Sound; Circuit; Copper; Silver; Engine.

l. A devicu for converting one form of energy

into another especially for convming other

forms of energy into mechanical (i.e. kinetic)