Keying Relay made by Amalgamated Wireless (Australasia) Ltd for a radio transmitter, circa 1914.
The relay is a safety device isolates the operator's morse key from the high voltage needed to operate the transmitter. The hand operated morse key switches the current through the coils on and off; activating the armature of the relay, thereby switching the high voltage (safely) to the transmitter.
Two solenoid coils mounted on wooden base with adjustable armature mechanism and terminals. Every major component has a letter on it.
The equipment is typical of early shipboard radio in the period prior to the First World War (1914 - 1918); it is rare.
Metal plate on one side of wooden base: AMALGAMATED WIRELESS (AUSTRALASIA) LTD / MARCONI TELEFUNKEN SYSTEM / SYDNEY. NSW. No 97/313 Stamped into same side of wooden base: TESTED 07-A Metal plate on other side of wooden base: AUSTRALIAN MANUFACTURE Brass plate on top of box: ALTERNATOR Brass plate on top of box: TRANSFORMER Brass plate on top of box: CONDENSER Brass plate on top of box: FUSE Brass plate on top of box: 2 KEY 1 Component letters: A(magnetic part of armature) / E(both coils) / F(mounting block) / C(top contact) / K(bottom contact) / N(contact support) / R(adjuster support) S(adjuster screw) / J(contact carrying part of armature)
Type of item
185 mm (Length), 160 mm (Width), 130 mm (Height)
187 mm (Length), 160 mm (Width), 126 mm (Height)
Measurement From Conservation.