Summary

Set of inductance coils: used in radio spark transmitters to put the primary circuit in resonance with the alternating current supply frequency, so as to efficiently charge the main energy storage capacitor.

Part of a set:
ST 021405 Rotary Converter - G. Weymouth Pty Ltd, Melbourne, Victoria
ST 021406 Low Frequency Inductance Coils
ST 021407 Transformer - G. Weymouth Pty Ltd, Melbourne, Victoria
ST 021408 Oil
ST 021409 High Frequency Air Core Choke Coils
ST 21409.1
ST 21409.2
ST 021410 Capacitor, Fixed
ST 021411 Oil
ST 021412 Oscillatory Transformer (Jigger)
ST 021413 High Frequency Inductance Coil
ST 021414 Rotary Discharger - AWA, Radio Transmitter
ST 021415 Aerial Tuning Inductance
ST 021416 Tune Indicator
ST 021417 Earth Arrester
ST 021418 Starter
ST 021419 Field Regulator
ST 21420 Morse Key
ST 021421 Tesla Coil
ST 021422 Variable Resistance
ST 021423 Coil Capacitor

Physical Description

Sectioned rectangular varnished box enclosing two bobbins each wound with 360 turns of no.12 double cotton covered (d.c.c.) copper wire wound in three layers. Each bobbin has an open core of iron wire and the two are mounted side by side. They are connected in parallel with tappings at various points, which connect to five terminals at the top of the box.

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