Items tagged electrical components in MV Collections
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Coherer - Radio Telegraphy, Jenvey, 1901
Coherer detector, used by H. W. Jenvey for the first Australian shore to ship communication with H. M. S. 'St. George' in May 1901 A later feature of telegraph networks was the use of ...
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Electronic Valve - Unknown Manufacturer, Thermal Relay, Type Unknown, 1940s.
Thermal relays such as this were used to delay the application of plate voltage to mercury vapour rectifiers for enough time for them to warm up properly. Premature application of plate ...
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Coherer - Marconi, Radio Receiver, circa 1900
The coherer was the first practical detector of radio waves. The phenomenon on which it is based was discovered in 1878 by D. E. Hughes and rediscovered by E. Branly in 1890. It was d ...
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Variable Capacitor - Polar, 1960s
Single gang air dielectric 500 pF variable condenser in original packaging. Made by Polar in England. Used in crystal sets and simple radios, but more likely in test instruments.
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Transformer - Stromberg Carlson, Radio, 1930s
Intermediate frequency transformer, double tuned type with air core. Used in radio receivers. Made by Stromberg Carlson. Used for 455 kc/s frequency. In operation until 1939. Transform ...
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Transformer - Klassic, Audio, circa 1930
Klassic transformer, audio, for interstage coupling in radio receivers. American manufacture, circa 1930.
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Ballast Lamp - Philips, Type 1457, 1926-1931
Dual filament current regulator used in Philips type 1453 battery charger; also called resistance lamp. A current regulator (ballast lamp or Barretter) uses an iron filament in a hydro ...
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Coherer - Gesellschaft für drahtlose Telegraphie System Telefunken, Radio, circa 1905
Coherer: Telefunken type, made by Gesellschaft Fur Drahltose Telegraphie in Germany circa 1905. Used by donor about 1905-06. Not the first commercial form.
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Crystal Detector - Unknown Maker, Variable, circa 1916
Detector for use in crystal radio receiver, with mechanical adjustment, circa 1916. This unit is professionally made and 'is a German pattern detector said to have been used before Wo ...
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Condenser - Marconi, Coil, Radio, circa 1910
Coil condenser, manufactured by Marconi. Condenser is used to reduce sparking across of the contacts of the interupter of a spark coil. It was normally used with a spark coil used in t ...
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