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