Contact-breaker. (The same as [Circuit-breaker], which see.)
Contact, Loose. A contact formed by two or several surfaces imposed one upon another and held by their weight alone.
Contact-point. A point, or stud, often of silver or platinum, arranged to come into touch with a contact-spring, such as the vibrating armature of an electric bell.
Contact-spring. A spring connected at one end of a lead and arranged to press against another spring or plate, so that a plug may be inserted between the contact-points.
Controller. The lever or handle on the switch-board of a resistance-coil, by means of which electric current is let in or kept out of a circuit.
Controlling Force. In galvanometers and similar instruments, the force used to bring the needle or indicator back to zero.
Converter. An induction-coil used with the alternating current for changing the potential difference and inverting the available current. High alternating voltage may be converted into lower direct-current voltage, thereby increasing the amperage or current. A converter consists of a core of thin iron sheets, wound with a primary coil of fine insulated wire, with many convolutions or turns. Also, a secondary coil made up of coarse insulated wire with fewer convolutions. The coil may be jacketed with iron to increase the permanence.
Converter, Rotary. A combined motor and dynamo whose function is to transform a current of high or low voltage (A-C., or D-C.) into any other kind of current desired.
Convolution. The state of being convolved; a turn, wrap, fold, or whorl. A clock-spring is a familiar example.
Copper-bath. A solution of sulphate of copper used in electro-plating, electrotyping, and copper-refining by electricity.