Crate

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Ingenium, 1972.0376.004
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OBJECT TYPE: N/A
DATE: Unknown
ARTIFACT NUMBER: 1972.0376.004

MANUFACTURER: Unknown
MODEL: Unknown
LOCATION: Unknown

More Information

General Information

Serial #: N/A
Part Number: 4
Total Parts: 4
AKA: N/A
Patents: N/A
General Description: Unknown

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: N/A
Thickness: N/A
Weight: N/A
Diameter: N/A
Volume: N/A

Lexicon

Group: Astronomy
Category: Observation equipment
Sub-Category: N/A

Manufacturer

AKA: Unknown
Country: Unknown
State/Province: Unknown
City: Unknown

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: Used to measure differences in zenith angles (angular distance) of stars from the zenith and thereby to determine the latitude of the instrument's location.
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: N/A
Missing: Some small component parts, hardware etc. missing. Presumably would have been used with striding level over mounting arm, and possibly tube or spirit level fitted to vertical circle; Diagonal eyepiece missing.
Finish: Unknown
Decoration: N/A

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Unknown Manufacturer, Crate, Unknown Date, Artifact no. 1972.0376, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingeniumcanada.org/en/id/1972.0376.004/

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