Crystal Set - late 1920s Object Reg. No: ST 36692

Homemade (in Australia) wooden box with set of Brandes "Superior" headphones. homemade aerial coil, Emmco vernier dial, cats-whisker detector. Late 1920s.

Wooden box is larger than necessary - probably first used for something else.
Brown wooden box (rough finish) with plywood panel on top carrying a transparent cylinder with brass fittings (crystal detector), dial and four metal screw terminals for aerial, earth and headphones. Two small windows on either side of the centre of the dial allowed the user to write the names of stations.
Turning the dial reveals a faded patch centred between the 50 and 60 marks (preseumably this was a regular setting when in use.

Pair of earpieces mounted on a headband with flexible cable, terminated with a pair of pin plugs. Earpieces are made of metal and bakelite. Each earpiece has two terminals which are connected in series using a Y shaped cable. The headband is made of two fabric covered spring wires and metal plated adjusters. As found, the adjusters are at their widest setting (big head?).
Acquisition Information:
Donation from Anonymous - Osman House, 1986
Discipline: Technology
Dimensions: 220 mm (Height), 210 mm (Width), 220 mm (Length)
Dimension Comment: Dimensions of wooden case.

More information

Tagged with: radio receivers, crystal sets
Themes this item is part of: Information & Communication Collection
Primary Classification: COMMUNICATIONS
Secondary Classification: Radio
Tertiary Classification: receivers
Inscriptions: Dial on box: EMMCO / (calibrated scale 0 to 100 in steps of 10)

On both earpieces: Brandes / Superior (italics) / + (BBC logo) / Pat's Pending / Matched Tone (italics) / TRADE MARK / Made in England
Date Made: Melbourne, Victoria, Australia, 1925-1926

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