Transit

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OBJECT TYPE
REPEATING
DATE
1912–1914
ARTIFACT NUMBER
1968.0381.001
MANUFACTURER
Cooke, T. & Sons Ltd.
MODEL
D.L.S.
LOCATION
London, England

More Information


General Information

Serial #
13646
Part Number
1
Total Parts
1
AKA
N/A
Patents
N/A
General Description
BRASS & GUN METAL CONSTRUCTION; HORIZONTAL & VERTICAL CIRCLES, AND VERNIERS DIVIDED ON SILVER. WHITE METAL LEVELLING SCREWS. GLASS OPTICS. ALUMINUM ACCESSORY CASE. WOODEN CASE HAS LEATHER COVERING.

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length
28.0 cm
Width
14.0 cm
Height
N/A
Thickness
N/A
Weight
N/A
Diameter
N/A
Volume
N/A

Lexicon

Group
Exploration and Survey
Category
Measurement-angles
Sub-Category
N/A

Manufacturer

AKA
Cooke
Country
England
State/Province
Unknown
City
London

Context

Country
Canada
State/Province
Unknown
Period
THIS INSTRUMENT USED C. 1913- 1931, AND POSSIBLY LATER.
Canada
MAGNETIC SURVEYS WERE CONDUCTED BY MEMBERS OF THE TOPOGRAPHICAL SURVEY OF CANADA AS EARLY AS 1880. EQUIPPED WITH MAGNETIC INSTRUMENTS THE TS SURVEYORS WERE ABLE TO UTILIZE THE BEARINGS OF LINES ALREADY DETERMINED FOR LAND SURVEYS, WITHOUT INCURRING THE ADDITIONAL EXPENSE OR DUPLICATION OF EFFORT REQUIRED TO MOUNT A SEPARATE MAGNETIC SURVEY. THIS TRANSIT IS KNOWN TO HAVE BEEN USED IN SUCH SURVEYS. (SEE TECHNICAL REPORT PREPARED BY H. BAJDIK, IN SUPP. INFO.)
Function
TRANSITS FITTED WITH BOTH A HORIZONTAL CIRCLE AND VERTICAL CIRCLE OR ARC MAY BE USED TO MEASURE BOTH HORIZONTAL AND VERTICAL ANGLES.
Technical
5-INCH HORIZONTAL CIRCLE HAS BEVELLED EDGE, DIVIDED 0-360 AT 30-MINUTE INTERVALS. VERNIERS DIVIDED 30-0BY SINGLE MINUTES; FITTED WITH 2 READING EYEPIECES. 4-INCH VERTICAL CIRCLE DIVIDED 0-90-0-90 AT 30-MINUTE INTERVALS; READ BY 2 VERNIERS, WITH READING EYEPIECES. LIGHTWEIGHT, COMPACT DESIGN WITH HIGH DEGREE OF PRECISION.
Area Notes
Unknown

Details

Markings
" T. COOKE & SONS LTD./ LONDON & YORK/ No 13646 " and "THE ONTARIO HUGHES OWENS CO. LTD." incised on base. "L 1703" incised on one standard.
Missing
ONE READING EYEPIECE OVER VERTICAL CIRCLE MISSING; SUPPORTING ARM BENT. COMPASS IS DAMAGED BUT INTACT. SOME PAINT LOSS.
Finish
BLACK PAINTED FINISH ON TRANSIT; DULL BRASS ADJUSTMENT SCREWS. SILVER CIRCLES. BROWN LEATHER COVERING ON WOOD CASE.
Decoration
N/A

CITE THIS OBJECT

If you choose to share our information about this collection object, please cite:

Cooke, T. & Sons Ltd., Transit, circa 1912–1914, Artifact no. 1968.0381, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingeniumcanada.org/en/id/1968.0381.001/

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