Summary
Tune (tuning) indicator: a lamp is connected to one end of a loop of wire and a adjustable tap. The loop is placed in series with the earth lead of the jigger secondary coil, and the tap is adjusted to give a reasonable brightness at maximum antenna current. Other positions might lead to bulb burn-out or the lamp being too dim to observe the light.
The lamp indicates by its brightness the current in the aerial circuit, which is adjusted for a maximum by varying the tuning inductor (jigger or spiral inductor).
Tune indicator ST 021416 achieves the same result as ST 21422 but in a different way.
Physical Description
Varnished wooden board with an approximately 270 degree arc of wire connected to two terminals. A wiper arm, fitted with a knob, is connected one side of a lamp socket; the other side is connected to one end of the loop. The globe is missing.
More Information
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Collecting Areas
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Acquisition Information
Donation from Amalgamated Wireless (Australasia) Ltd., 12 Mar 1940
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Manufacturer
Amalgamated Wireless (Australasia) Ltd., Sydney, Greater Sydney, New South Wales, Australia, 1914-1920
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Inscriptions
Base: AMALAGAMATED WIRELESS / (A-SIA) LTD / No 87-4837 SYDNEY. N.S.W. / AUSTRALIAN MANUFACTURE
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Brand Names
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Classification
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Category
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Discipline
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Type of item
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Overall Dimensions
153 mm (Length), 150 mm (Width), 55 mm (Height)
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Keywords
