Theodolite

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Ingenium, 1988.1316.001
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OBJECT TYPE: PORTABLE/5 1/2 INCH
DATE: 1922
ARTIFACT NUMBER: 1988.1316.001

MANUFACTURER: Troughton & Simms
MODEL: 12146
LOCATION: London, England

More Information

General Information

Serial #: N/A
Part Number: 1
Total Parts: 1
AKA: N/A
Patents: N/A
General Description: LARGELY BRASS; CIRCLES AND VERNIERS DIVIDED ON SOLID SILVER; GLASS OPTICS.

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: 15.0 cm
Height: 33.0 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: Troughton Simms
Country: England
State/Province: Unknown
City: London

Context

Country: Canada
State/Province: Unknown
Period: THIS TRANSIT PROBABLY USED C. 1920S TO 1950S, AND POSSIBLY LATER.
Canada: PART OF A COLLECTION OF FORESTRY EQUIPMENT AND DOCUMENTATION ACQUIRED FROM THE PETAWAWA FORESTRY MUSEUM IN 1988. THE FORESTRY SERVICE PRESUMABLY ACQUIRED THIS THEODOLITE FROM THE SURPLUS INVENTORY OF EMR: THE TOPOGRAPHICAL SURVEY INVENTORY NO. IS CLEARLYINCISED ON THE THEODOLITE BED.
Function: USED TO MEASURE BOTH HORIZONTAL & VERTICAL ANGLES.
Technical: EXAMPLE OF COMPACT, PORTABLE THEODOLITE POSESSING ACHROMATIC ASTRONOMICAL (INVERTING) OPTICS & INTERNAL DRAWTUBE; AND FINELY DIVIDED CIRCLES GRADUATED 30 MINUTES, READING TO ONE MIUTE.
Area Notes: Unknown

Details

Markings: " THE TOPLEY COMPANY/ OTTAWA CANADA " & logo incised on theodolite bed, below tube level; " No 12146 " incised above. T.S.984 " incised in bed, opposite. Intertwined "T" & "S" logo incised on telescope body tube. Vertical circle graduated 0-90-0-90-0, and divided to half-degrees; verniers incised "C" & "D" divided 0-30 and read by magnifying eyepieces. Horizontal circle graduated 0-360, and divided to half-degrees; verniers incised "A" & "B" divided 0-30, and read by hinged, screw-type magnifying eyepieces.
Missing: NONE. CROSSHAIR SIGHT MISSING OR BROKEN. EYEPIECE CASING & VERTICAL CIRCLE DENTED.
Finish: NATURAL BRASS FINISH ON MOST SURFACES; SELECTED AREAS & COMPONENT PARTS (IE. THEODOLITE BED, PINNIONS, INNER SUPPORTS FOR VERTICAL CIRCLE) HAVE BEEN CHEMICALLY DARKENED.
Decoration: N/A

CITE THIS OBJECT

If you choose to share our information about this collection object, please cite:

Troughton & Simms, Theodolite, before 1922, Artifact no. 1988.1316, Ingenium – Canada’s Museums of Science and Innovation, http://collections.ingeniumcanada.org/en/id/1988.1316.001/

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