Ads
related to: value of old crank telephones
Search results
Results from the WOW.Com Content Network
A telephone magneto is a hand-cranked electrical generator that uses permanent magnets to produce alternating current from a rotating armature. In early telegraphy , magnetos were used to power instruments, while in telephony they were used to generate electrical current to drive electromechanical ringers in telephone sets and activate signals ...
A typical Western Electric hand telephone set of c. 1930. It consists of a handset mounting with the handset held in a cradle, and a subscriber set mounted against a wall or vertical surface in close proximity. Shown is a B1A hand telephone set, also known as the type 102B-3 hand telephone set.
The first field telephones had a battery to power the voice transmission, a hand-cranked generator to signal another field telephone or a manually-operated telephone exchange, and an electromagnetic ringer which sounded when current from a remote generator arrived. This technology was used from the 1910s to the 1980s.
These made telephones an available and comfortable communication tool for many purposes, and it gave the impetus for the creation of a new industrial sector. The telephone exchange was an idea of the Hungarian engineer Tivadar Puskás (1844–1893) in 1876, while he was working for Thomas Edison on a telegraph exchange.
For premium support please call: 800-290-4726 more ways to reach us
The model 302 telephone is a desk set telephone that was manufactured in the United States by Western Electric from 1937 until 1955, and by Northern Electric in Canada until the late 1950s, until well after the introduction of the 500-type telephone in 1949. The sets were routinely refurbished into the 1960s.
If old cell phones aren't the only vintage items you have stored away in your home, take a look at what some of the most valuable VHS tapes are going for. Related Articles AOL
Alabama Telephone Company; All American Direct; American Cable and Radio Corporation; Ameritech; Andrew Corporation; AT&T Communications (1984–2010) AT&T Corporation; Atlantic and Pacific Telegraph Company; AT&T Broadband; Automatic Electric
Ads
related to: value of old crank telephones