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Telegraph Pole Changer - circa 1880s
Reg. No: ST 022106
- Summary:
- A relay used in some telegraph systems which reverses the conections of one or more circuits. Used at Melbourne Observatory.
- Description:
- Wooden base supporting a brass baseplate. Steel or iron 'L' piece mounted on baseplate supports two coils with parallel horizontal axes. 'L' piece also supports a horizontal brass plate above the coils. This plate carries spring contacts anf four brass screw terminals.
- Acquisition Information:
- Transfer from Melbourne Observatory, 1945
| Discipline: | Technology |
| Dimensions: | 120 mm (Height), 120 mm (Width), 215 mm (Length) |
More information
| Tagged with: | electrical relays, telegraphy |
| 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: | components |
| Inscriptions: | Inscribed on baseplate: "678". Scratched or written on baseplate in two places: '384' Engraved on baseplate in two places: '3' |
| User: | Melbourne Observatory, South Yarra, Victoria, Australia |
Themes
This item is part of the following themes:
- 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
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