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Telegraph Relay - Siemens Bros, Non-Polarized, post 1865 Object Reg. No: ST 028635

Summary:
Siemens relay used at telegraph receiving stations, particularly those operating on long connecting lines. Often signals received over long lines were too weak to operate the receiving instruments directly so the relay served as a very sensitive switch to connect a local battery to the receiving instruments.

Used at Melbourne Observatory.
Description:
Brass baseplate on wooden base carries two horizontal coils. Brass components and screws. Four brass terminals, two on each side of wooden base.

Fitted with wooden-framed glass cover.
Acquisition Information:
Transfer from Melbourne Observatory, 1945
Discipline: Technology
Dimensions: 138 mm (Height), 152 mm (Width), 212 mm (Length)

More information

Tagged with: electrical relays, telegraphy, -1
Themes this item is part of: Telegraphy Collection, Melbourne Observatory Collection, Information & Communication Collection, Positional Astronomy at Melbourne Observatory, Weights & Measures at Melbourne Observatory, Melbourne Observatory & Standard Time in Victoria, Astrographic Catalogue, Transits of Venus, 1874 & 1882, Buildings at Melbourne Observatory, Star Observations & Personal Equation, Meteorology at Melbourne Observatory, 1863-1908, Melbourne Observatory, 1863-1944, Geodetic Survey of Victoria, 1858-1872
Primary Classification: COMMUNICATIONS
Secondary Classification: Telegraphy
Tertiary Classification: input/output
Inscriptions: Brass baseplate inscribed:
"PATENT
SIEMENS BROTHERS
LONDON
No 1025"

Brass baseplate scratched:
"109"

Marked in white ink on wooden base:
"109"
Manufacturer: Siemens Bros Dynamo Works Ltd, 1865 or later

Information on Siemens Bros from http://distantwriting.co.uk/appendices.aspx (accessed 27 Feb 2009).
User: Melbourne Observatory, South Yarra, Victoria, Australia

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