'Resonator and sounder. The speed with which morse code messages can be read by sound is greater than by sight. The sounder consists of an electromagnet relay which by means of a suitably shared anvil makes a sharp noise when activated by electric current. to enable operators to define these sounds is more clearly the sounder is placed in a resonator to amplify the coded message as it is being received." from label accompanying accession number B712.

The equipment and photographs were received from the Deputy Director, Posts and Telegraphs.

Telegraph sounder, wood / metal, maker unknown, used by Posts and Telegraphs Postmaster General's Department, Sydney, New South Wales, Australia, 1920-1937

A telegraph sounder consisting of a brass mechanism with a pivoting arm on a square polished wooden base. Towards the centre of the sound relay are two black metal cylinders. Between the two black cylinders is a metal spring that connects one side of the sound relay to the other. There is a brass screw in each corner of the the wooden base. Three of the four screws are attaching a small rectangular plate to the underside of the wooden base.

Made: 1920 - 1937


Used: Postmaster-General's Department; Sydney; 1920 - 1937

Engraved into the side of the wooden base '13261'.

B712-3

1920 - 1937

105 mm

113 mm

113 mm