Cover, lens
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1972.0376.005
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- OBJECT TYPE
- TELESCOPE
- DATE
- 1872
- ARTIFACT NUMBER
- 1972.0376.005
- MANUFACTURER
- Troughton & Simms
- MODEL
- Unknown
- LOCATION
- London, England
More Information
General Information
- Serial #
- N/A
- Part Number
- 5
- Total Parts
- 5
- AKA
- N/A
- Patents
- N/A
- General Description
- Brass lens cover
Dimensions
Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.
- Length
- N/A
- Width
- N/A
- Height
- 2.7 cm
- Thickness
- N/A
- Weight
- N/A
- Diameter
- 8.4 cm
- Volume
- N/A
Lexicon
- Group
- Astronomy
- Category
- Observation equipment
- Sub-Category
- N/A
Manufacturer
- AKA
- Troughton Simms
- Country
- England
- State/Province
- Unknown
- City
- London
Context
- Country
- Canada
- State/Province
- Unknown
- Period
- This instrument presumably used 1872+
- Canada
-
Instrument used by Topographical Survey (Div), Dept. of the Interior. It was reportedly among the instruments used on 49th parallel boundary survey of 1872-1874. It was also said to have been used in the survey of the railway belt required by the entry of BC into Confederation in 1871. - Function
-
To cover and protect the surface of a lens frfom scratching or dust when not in use. - Technical
-
From Chauvenet, v. II, p. 340: The zenith telescope is a portable instrument specially adapted for the measurement of small differences of zenith distance. It is essentially the invention of Capt. Andrew Talcott, of the U. S. Corps of Engineers (in 1834); but, having been exclusively adopted in the U. S. Coast Survey for the determination of latitudes, it has there received several improvements, which have given it a more general character than it possessed at first. As now constructed [1891], it can be used at all zenith distances, and may be regarded as designed for the comparison of any two nearly equal zenith distances in any azimuths. The method of finding the latitude by this instrument, now known as Talcott's Method, is one of the most valuable improvements in practical astronomy of recent years, surpassing all previously known methods (not excepting that of bessel by prime vertical transits) both in simplicity and in accuracy. - Area Notes
-
Unknown
Details
- Markings
- None apparent
- Missing
- N/A
- Finish
- Brass-coloured metal cover with knurling around the proper front edge.
- Decoration
- N/A
CITE THIS OBJECT
If you choose to share our information about this collection object, please cite:
Troughton & Simms, Cover, lens, 1872, Artifact no. 1972.0376, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingeniumcanada.org/en/id/1972.0376.005/
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