General Information

Serial #

13168

Part Number

1

Total Parts

3

AKA

N/A

Patents

N/A

General Description

CIRCLES & VERNIERS DIVIDED ON SILVER/ BRASS TELESCOPE BODY TUBE, MICROSCOPE BODY TUBES, BASE & LEVELLING FEET/ FERROUS & NON-FERROUS METAL CONSTRUCTION/ GLASS OPTICS/ SYNTHETIC MICROMETER SCREW SCALES/ WOODEN LAMP BRACKET BASE, KNOBS ON.2 &.3

Dimensions

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

Length

53.0 cm

Width

41.0 cm

Height

43.0 cm

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 & York

Context

Country

Unknown

State/Province

Unknown

Period

PROBABLY USED C.1900-1935

Canada

Unknown

Function

TO MEASURE HORIZONTAL ANGLES BY SIGHTING ON A PROJECTED SIGNAL.

Technical

EXAMPLE OF LARGE GEODETIC THEODOLITE USED FOR PRECISE MEASUREMENT DURING TRIANGULATION SURVEYS. THESE INSTRUMENTS WERE QUICKLY DISPLACED BY THE DEVELOPMENT OF PRECISE THEODOLITES BY ZEISS & WILD IN THE EARLY 1920S, AND BY THE BRITISH TAVISTOCK THEODOLITES.

Area Notes

Unknown

Details

Markings

.1 'T. COOKE & SONS LTD. LONDON & YORK NO. 13168' INCISED ON TELESCOPE BODY TUBE/ 2 VERTICAL CIRCLES, BOTH GRADUATED 0-90-0-90 AT 30-MINUTE INTERVALS; DOUBLE VERNIERS LABELLED A&B, EACH GRADUATED 30-0 & 0-30 BY SINGLE MINUTES/ 2 TUBE LEVELS ON PLATE GRADUATED '1 DIV.=4. 5" './ MICROMETERS LABELLED 'A', 'B', & 'C': MICROMETER SCREWS GRADUATED 0-60 BY SINGLE DIVISIONS/ HORIZONTAL CIRCLE DIVIDED 0-360- DEGREES AT 5-SECOND INTERVALS.

Missing

THREADED CAP TO SECURE FILTER DISC OVER ONE TRUNNION. TUBE LEVEL VIAL ON ONE VERTICAL CIRCLE CRACKED & EMPTY. LENS FROM .3 LAMP MISSING

Finish

PAINTED BLACK ENAMEL FINISH ON MOST SURFACES; READING MICROSCOPE & READING MICROMETER EYEPIECES HAVE LACQUERED BRASS BODY TUBES; MICROMETER SCREWS, LEVELLING FEET, OBJECTIVE LENS HOUSING & SELECTED FITTINGS ALSO LACQUERED BRASS.

Decoration

N/A