Maybe the refrigerator is on a separate circuit breaker!

If the current is interrupted or alternating, and if a telephone receiver has its terminals connected to a separate metallic circuit joined by earth plates at two other places to the earth, not on the same equipotential surface of the first circuit, sounds will be heard in the telephone due to a current passing through it.

This consists of a low resistance coil of copper wire enclosed in a laminated iron circuit similar to the magnetic shunt already de Magnetic scribed.

In such cases it is usual to employ a local battery to produce the signals, and to close the local battery circuit by means of a relay working.

In the receiver there is a strong electromagnet, excited by a local current, which has in its circuit two annular air gaps, across which the magnetic field is practically uniform and constant.

It will be observed that the circuit is not in this case actually open; the meaning of the expression " open circuit " is " no battery to line."

The oldest and best known is the " two pipe " system, others being the " one pipe " or " simple circuit," and the " drop " or " overhead."

Morse showed, by experiments made in 1842 on a canal at Washington, that it was possible to interrupt the metallic electric circuit in two places and yet retain power of electric Morse.

Morse showed, by experiments made in 1842 on a canal at Washington, that it was possible to interrupt the metallic electric circuit in two places and yet retain power of electric Morse.

When a current passes through R the armature A is attracted and the local circuit is closed through the armature at b.

When a current passes through R the armature A is attracted and the local circuit is closed through the armature at b.

Hence, by inserting a break-and-make key in the circuit of the battery, coil or dynamo, the uniform noise or hum in the telephone can be cut up into periods of long and short noises, which can be made to yield the signals of the Morse alphabet.

- Wireless Telegraphy The early attempts to achieve electric telegraphy involved the use of a complete metallic circuit, but K.

- Open Circuit, Single- (not in Great Britain).

for the longest circuit to be worked, the shorter circuits being brought up approximately to a level, as regards resistance, by the insertion of resistance coils in the circuit of the transmitting apparatus of each shorter line.

In order to relieve the circuit judges the legislature has established by special acts inferior courts, generally with criminal jurisdiction only, in nine counties of the state.

The current thus sent to the line may be made either to act directly on the printing instrument or to close a local circuit by means of a relay.

It consists in punching, by means of " a puncher," a series of holes in a strip of paper in such a way that, when the strip is sent through another instrument, called the " transmitter," the holes cause the circuit to be closed at the proper times and for the proper proportionate intervals for the message to be correctly printed by the receiving instrument or recorder.

This machine reproduces a copy of the original transmitting slip, which can be passed on to any other Wheatstone circuit or can be run through a " Creed printer," which is a pneumatic machine actuating a typewriter by means of valves.

Under these circumstances a small portion of the current from the battery is shunted through the galvanometer circuit, and can be used to make electric signals.