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Doorbell mechanism from 1884 in Andrássy Avenue, Budapest Antique mechanically operated shop doorbell on a torsion spring. William Murdoch, a Scottish inventor, installed a number of his own innovations in his house, built in Birmingham in 1817; one of these was a loud doorbell, that worked using a piped system of compressed air. [1]
Wire colours changed to typical North American standard: 05:19, 14 November 2013: 964 × 715 (72 KB) Hydrargyrum: Removed unneeded reference layer; trimmed whitespace: 04:05, 14 November 2013: 964 × 715 (81 KB) Hydrargyrum: User created page with UploadWizard
In the early 1970s new aluminium wire made from one of several special alloys was introduced, and all devices – breakers, switches, receptacles, splice connectors, wire nuts, etc. — were specially designed for the purpose. These newer aluminium wires and special designs address problems with junctions between dissimilar metals, oxidation on ...
Crimped connectors are a type of solderless connection, using mechanical friction and uniform deformation to secure a connector to a pre-stripped wire (usually stranded). [1] Crimping is used in splice connectors, crimped multipin plugs and sockets, and crimped coaxial connectors. Crimping usually requires a specialised crimping tool, but the ...
A connector more closely resembling the present-day twist-on type was patented in Canada by Marr in 1931, and in the US in 1933. "Wire Connector", Canadian Patent CA 311638 Issued 26 May 1931. "Wire Connecter" U.S. patent 1,896,322, Filed November 24, 1930, Patented February 7, 1933
One of the first was the oscillating electric wire invented by James Marsh in 1824. [6] [5] This consisted of a wire pendulum dipping into a mercury trough, suspended between the poles of an electromagnet. When current was passed through the wire, the force of the magnet made the wire swing sideways, out of the mercury, which broke the current ...