The rotary dial is a device mounted on or in a telephone or switchboard that is designed to send electrical pulses, known as pulse dialing, corresponding to the number dialed. The early form of the rotary dial used lugs on a finger plate instead of holes. A patent was filed on August 20, 1896 by employees of Almon Strowger, namely, A. E. Keith and the brothers John and Charles Erickson. The Patent No. 597,062 was granted on January 11, 1898.
The modern version of the rotary dial with holes was first introduced in 1904 but only entered service in the Bell System in 1919. The rotary dial was gradually supplanted by Touch Tone dialing, introduced at the 1962 World's Fair, which uses a keypad instead of a dial. Some telephone systems in the US no longer recognize rotary dialing by default, but will only support push-button phones instead, in which case the rotary dialing system would have to be ordered from the telephone company as a special feature, to support older customer equipment. However most actually do accept dial phoning without fail.
No comments:
Post a Comment