 Candlestick telephones required the nearby installation of a subscriber set ("subset", ringer box), which housed the ringer to announce incoming calls and the electric circuitry (capacitor, induction coil, signaling generator, connection terminals) to connect the set to the telephone network.When automatic telephone exchanges were introduced, the base of a candlestick also featured a rotary dial, used for signaling the telephone number of an intended call recipient.Candlestick telephones were produced in various models by many manufacturers.