General Information

Serial #

86973

Part Number

1

Total Parts

7

AKA

N/A

Patents

N/A

General Description

PRIMARILY METALS, INCLUDING STEEL, BRASS & ALUMINUM. GLASS OPTICS & ILLUMINATION COMPONENTS. METAL, GLASS & SYNTHETIC COMPONENT PARTS. PACKING CASES ARE WOOD WITH METAL HARDWARE & METAL REINFORCED EDGES OR ARE METAL WITH WOODEN LINERS.

Dimensions

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

Length

55.0 cm

Width

42.0 cm

Height

52.5 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Astronomy

Category

Observation equipment

Sub-Category

N/A

Manufacturer

AKA

Wild

Country

Switzerland

State/Province

Unknown

City

Heerbrugg

Context

Country

Canada

State/Province

Unknown

Period

THIS INSTRUMENT USED C.1950-1975. T4 THEODOLITESUSED IN 1990S IN MANY THIRD WORLD COUNTRIES.

Canada

USED BY GEODETIC SURVEY OF CANADA FOR MOST PRECISE TRIANGULTION WORK. GSC'S WORK WITH ASTRONOMICAL THEODOLITES & ASSOCIATION WITH WILD HEERBRUGG RESULTED IN DESIGN FEATURES & IMPROVEMENTS: IN THE T4 IT WAS USE OF AN UPPER CONICAL BALL BEARING IN VERTICAL AXIS SYSTEM. THIS RESULTS IN AUTOMATIC EXACT CENTERING (REF.1, P.8)

Function

USED FOR HIGH-PRECISION ANGULAR MEASUREMENTS IN FIRST ORDER TRIANGULATION AND HIGH PRECISION GEOGRAPHICAL DETERMINATION.

Technical

MOST ACCURATE THEODOLITE MADE IN ITS DAY: THE T4 WENT OUT OF USE WHEN GPS MADE TRIANGULATION UNNECESSARY. FEATURES GLASS CIRCLES READ BY OPTICAL MICROMETER: THE MEAN OF DIAMETRICALLY OPPOSITE PARTS OF CIRCLE IS OBTAINED IN SINGLE READING & WITHOUT CALCULATION. OPTICS OF READING SYSTEM ARE INTERNAL, & SO ARE UNAFFECTED BY OUTSIDE INFLUENCES. AFTER BEING LEVELLED THE INSTRUMENT WAS READY FOR USE. (REF.1 & 2)

Area Notes

Unknown

Details

Markings

'WILD/ HEERBRUGG/ SWITZERLAND/ T4-86973' INCISED IN BASE OF STANDARDS. HORIZONTAL SETTING CIRCLE GRADUATED 0-360 BY SINGLE DEGREES. 'D 64-47' INCISED ON HORIZONTAL CLAMP. PLATES INCISED '4 Volt' & 'Chronograph' LABEL CONNECTORS./ .1- .2PT Cases: Wild, Wild of Canada Limited and wade plates and decals applied to case exterior. Both cases also have mailing label applied to front which includes following text: "To/ GEODETIC SURVEY OF CANADA/ 360 LEBRETON STREET,/ OTTAWA ONT. ". Remnants of other labels, decals, etc. also present on both cases./ .1PT also has silver decal inside lid marked: "[logo]/ wade/ DATE 6 MAY 1985/ SER. NO. T4/ 86973/ J.D. "/ 900280 PT box: Decal on box top reads: " WILD OF CANADA LIMITED/ 881 Lady Ellen Place/ OTTAWA ONTARIO ". Mfr's plate screwed to box top reads: "WILD/ HEERBRUGG/ SWITZERLAND/ No 86973".

Missing

UNKNOWN. APPEARS COMPLETE, WITH MOST ACCESSORIES. .4 SUNSCREEN CRACKED & PROBABLY UNUSABLE. ORIGINALLY SUPPLIED WITH BATTERY BOX CONTAINING 6 DRY CELLS (4.5V): THIS UNIT USED 4V BATTERY AND MAY HAVE BEEN MODIFIED.

Finish

THEODOLITE LEVELS & BASE HAVE DRAB-GREEN ENAMEL PAINTED FINISH; SILVER METAL FITTINGS./ .1pt Case: silver metal; green-painted wood liner./ 900280 PT box containing accessory equipment: Wooden box has metal reinforced corners, hinges, etc.; leather carrying handle.

Decoration

N/A