General Information

Serial #

17861

Part Number

1

Total Parts

2

AKA

N/A

Patents

N/A

General Description

BRASS AND OTHER METALS; GLASS OPTICS; CIRCLES & VERNIERS DIVIDED ON SILVER

Dimensions

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

Length

5.0 cm

Width

4.0 cm

Height

5.0 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

STEINHEIL

Country

Germany

State/Province

Unknown

City

Munich

Context

Country

Canada

State/Province

British Columbia

Period

BETWEEN 1887-1894

Canada

USED BY MR. J.J. MCARTHUR, DLS IN TOPOGRAPHICAL SURVEYOF ROCKY MOUNTAINS, 1887-1892: THIS WAS FIRST SURVEY MADE IN CANADA BY PHOTOGRAPHIC METHODS (SEE ALSO SURVEY CAMERA 680392). USED 1893-1894 IN TOPOGRAPHICAL SURVEY OF B.C.-ALASKA BOUNDARY.

Function

TO MEASURE HORIZONTAL & VERTICAL ANGLES. THIS THEODOLITE ESPECIALLY SUITED TO MERIDIAN MEASUREMENT (IE. BY OBSERVING POSITION & MOVEMENT OF STARS.)

Technical

EXTREMELY SMALL, LIGHT AND COMPACT THEODOLITE CAPABLE OF PERFORMING PRECISE MEASUREMENTS. PRISMATIC OBJECTIVE LENS WHICH MAY BE ROTATED FULLY 360-DEGREES AND ABILITY TO REVERSE TELESCOPE IN ITS AXIS ALLOWS FOR OBSERVATION OF STARS AND THEREFORE MERIDIAN MEASUREMENT. THIS INSTRUMENT IS HIGHLY UNUSUAL AND OF FINEST QUALITY.

Area Notes

Unknown

Details

Markings

'Steinheil in Munichen No. 17861' INCISED IN PLATE/ 'T.S. 45' INCISED ON VERTICAL CIRCLE BACK & ON UNDERSIDE OF LIMB/ VERTICAL CIRCLE GRADUATED 0-360 AT 20-MINUTE INTERVALS; FITTED WITH TWO SETS OF DOUBLE VERNIERS GRADUATED 20-0 BY SINGLE MINUTES/ HORIZONTAL CIRCLE GRADUATED 0-360 AT 20-MINUTE INTERVALS; FIXED DOUBLEVERNIERS GRADUATED 0-20 BY SINGLE MINUTES

Missing

1 READING EYEPIECE MISSING/ 1 VERNIER POST ON VERTICAL CIRCLE BENT/ OPTICS EXTREMELY DIRTY/ PROBABLY MISSING STRIDING LEVEL.

Finish

BRIGHT LACQUERED BRASS TELESCOPE BODY TUBE/ GERMAN SILVER OR NICKEL-PLATED LEVELLING SCREWS/ BLACK OXIDIZED FINISH ON EYEPIECE & PRISM LENSES, MAGNIFYING EYEPIECES OVER CIRCLES AND SOME SMALL FITTINGS/ HIGHLY REFLECTIVE COPPER-COLOURED FINISH ON VERTICAL & HORIZONTAL CIRCLES, TELESCOPE AXIS SUPPORTS, AND SOME SMALL FITTINGS/ SOME FITTINGS HAVE BEEN BLUED

Decoration

N/A