Anvil

An intermittent contact, or "make and break" of the current is sometimes two being terminals of the circuit. The surface or stud on which such pre ure is produced is called the anvil. The ordinary telegraph key, which makes a contact by the pre ure of the operator's fingers does it by making a contact between a contact piece upon the front end of the key and the anvil. In the induction coil the anvil is also found. Thus in the cut representing the end of an induction coil and its circuit breaker in which O and O' and P and P' represent the secondary circuit terminal connections A is the core of soft iron wires, h is the anvil; the hammer when resting upon it so as to be in contact closes the circuit. When the current coming from the primary to the post i, pa es through the hammer and anvil h, and emerges by m, it magnetizes the core; this attracts the hammer, which is made of or is armed with a ma of iron. This breaks the circuit. The hammer falls at once on the anvil, again making the circuit, and the action is repeated with great rapidity. Hammer and anvil or key and anvil connections should be made of platinum. IMG:8956969607833025625_038F17.jpg: Fig. 17. INDUCTION COIL CIRCUIT BREAKER. 38   STANDARD ELECTRICAL DICTIONARY.