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Telegraph Relay - Theiler & Sons, Polarized, 1861-91 Object Reg. No: ST 008464

Summary:
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.

A polarized relay incorporated a permanent magnet in its design. Because this type of relay depended completely on magnetic effects, it was faster and more sensitive in operation than a non-polarized relay which incoporated a mechanical return spring.
Description:
Wooden base. Brass vertical cylindrical case with glass top. Brass terminals around base.
Discipline: Technology
Dimensions: 105 mm (Height), 140 mm (Width), 163 mm (Length)

More information

Tagged with: electrical relays, telegraphy, lamps, 1841 lamps, 1841 stove
Themes this item is part of: The Australian telegraph network 1854-1877, Copy of text for label for Polarised Telegraph Relay - Siemens Pattern, 1916, Telegraphy Collection, Information & Communication Collection
Primary Classification: COMMUNICATIONS
Secondary Classification: Telegraphy
Tertiary Classification: input/output
Inscriptions: Engraved on brass plate beneath glass top:
"M. THEILER & SONS
LONDON"
Manufacturer: M. W. Theiler & Sons, London, England, Great Britain

Comments

Feuz Martin Posted on 01 Apr 2010 5:50 AM
Good evening
Do you have a picture from this Telegraph relay which was manufactured by Theiler & Sons Londen (Reg. No: ST 008464)?
Thanks a lot
Kind regards
Martin Feuz
Discovery Centre Posted on 08 Apr 2010 12:13 PM
Museum Victoria Comment
Hi Martin, we have captured an image which you will be able to see in a few days here on the website.
Martin Feuz Posted on 29 Jan 2014 7:45 AM
Hi,
Thanks for the images. Do you have any proof that this relay is from Theiler? I can't find out a signature on this relay.
Thanks a lot for your help.
Martin Feuz

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