Theodolite
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1990.0280.001
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- OBJECT TYPE
- UNIVERSAL/ASTRONOMICAL
- DATE
- 1960
- ARTIFACT NUMBER
- 1990.0280.001
- MANUFACTURER
- Wild, Henry Surveying Instruments Supply Co. Ltd.
- MODEL
- T4
- LOCATION
- Heerbrugg, Switzerland
More Information
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
CITE THIS OBJECT
If you choose to share our information about this collection object, please cite:
Wild, Henry Surveying Instruments Supply Co. Ltd., Theodolite, circa 1960, Artifact no. 1990.0280, Ingenium – Canada’s Museums of Science and Innovation, http://collections.ingeniumcanada.org/en/id/1990.0280.001/
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