Telescope, transit
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1970.0218.001
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- OBJECT TYPE
- Refracting
- DATE
- 1900–1921
- ARTIFACT NUMBER
- 1970.0218.001
- MANUFACTURER
- Cooke, T. & Sons Ltd.
- MODEL
- Unknown
- LOCATION
- Unknown
More Information
General Information
- Serial #
- N/A
- Part Number
- 1
- Total Parts
- 7
- AKA
- N/A
- Patents
- N/A
- General Description
- Metal (including brass), glass
Dimensions
Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.
- Length
- 109.0 cm
- Width
- 61.0 cm
- Height
- 25.5 cm
- Thickness
- N/A
- Weight
- N/A
- Diameter
- N/A
- Volume
- N/A
Lexicon
- Group
- Astronomy
- Category
- Observation equipment
- Sub-Category
- N/A
Manufacturer
- AKA
- Cooke
- Country
- Unknown
- State/Province
- Unknown
- City
- Unknown
Context
- Country
- Canada
- State/Province
- Unknown
- Period
- ca. 1900-1940
- Canada
-
One of the primary instruments used to determine time. It is not know if this particular instrument was solely used in Ottawa or as a primary survey transit for first order triangulation mapping projects. If the latter, it would have been used to determine the longitude of the primary reference points. If/when used in Ottawa, it would have been used to determine the time of Ottawa used as the primary or secondary instrument to define standard time for Canada and to determine the slowing or speeding up of the Earth. This is a typical astronomical transit telescope with design features having appeared in Troughton & Simms transits ca. 1850. - Function
-
Used to measure the passage of stars across the meridian in order to precisely determine the local time. - Technical
-
The transit telescope is a moderate sized instrument made by the best manufactures of the day. The transit telescope first appeared ca. 1705 in Denmark having been created by Ole Romer. The instrument is different from other astronomical telescopes in that its axis is constrained to move in the N-S plane of the sky through the zenith. They were designed to be reversed on the axis in order to observe and correct errors in the alignment of the axis. - Area Notes
-
Unknown
Details
- Markings
- .3 Dial marked off from 0-90. .4 Engraved 'T. COOKE & SONS LTD./ LONDON & YORK' & '2'; Dial on side marked off from 0-90 and circle on face marked off from 0-40; An arrow and 'OUT' can be seen on inner pt. .8 Label on crate reads: "ASTRONOMICAL INSTRUMENTS/ WITH CARE'
- Missing
- From CA of 01/18/2002 by Matthew Bruce: No - appears complete
- Finish
- .1 Brass-coloured & painted black, silver-coloured eyepiece/ .2 Brass colour/ .3 Brass-coloured, some bright, some tarnished-looking areas, some black & some dull red pts/ .4 Brass colour with black pts/ .5 Brass-colour, appears black inside/ .6 Painted black, brass colour on ends/ .7 Painted black, brass-coloured pts./.8 Painted dark brown.
- Decoration
- N/A
CITE THIS OBJECT
If you choose to share our information about this collection object, please cite:
Cooke, T. & Sons Ltd., Telescope, transit, between 1900–1921, Artifact no. 1970.0218, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingeniumcanada.org/en/id/1970.0218.001/
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