Alidade

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Ingenium, 2004.0016.001
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OBJECT TYPE: STRAIGHT EDGE/GRADUATED/FOLDING
DATE: 1920–1930
ARTIFACT NUMBER: 2004.0016.001

MANUFACTURER: Raw, J. Frank Co. Ltd.
MODEL: Unknown
LOCATION: Toronto, Ontario, Canada

More Information

General Information

Serial #: N/A
Part Number: 1
Total Parts: 1
AKA: N/A
Patents: N/A
General Description: ALUMINUM AND BRASS ALIDADE; STRING GNOMEN.

Dimensions

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

Length: 45.7 cm
Width: 3.5 cm
Height: 12.0 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: Raw
Country: Canada
State/Province: Ontario
City: Toronto

Context

Country: Canada
State/Province: Unknown
Period: THIS ALIDADE PROBABLY USED C.1920S+
Canada: ALIDADE WAS AMONG SURVEY INSTRUMENTS COLLECTED BY MR. LOU SEBERT, A TOPOGRAPHICAL SURVEYOR AND MAPPER WHO WORKED FOR THE CANADIAN ARMY'S SURVEY AND MAPPING DIVISION, AND CLOSELY WITH THE STAFF OF THE TOPOGRAPHICAL SURVEY OF CANADA. HE AUTHORED MANY PAPERS AND WAS CO-EDITOR OF 'MAPPING A NORTHERN LAND' (1999). THIS ALIDADE WAS USED BY THE TOPOGRAPHICAL SURVEY OF CANADA.
Function: USED ON A PLANE TABLE TOP FOR TAKING SIGHTS AND DRAWING LINES WHEN LOCATING POINTS ON A MAP.
Technical: ALUMINUM ALIDADE DIVIDED ON ONE EDGE IN INCHES: ONE SECTION DIVIDED IN INCREMENTS OF.05.
Area Notes: Unknown

Details

Markings: "Made by/ THE J. FRANK RAW Co. Ltd./ TORONTO" and "T.S. 1967" incised in top surface of alidade. Scales incised in lower side edge of alidade divided in inches: one scale labelled "1" to "6 INCHES", with small section (on left side) divided 0-5-0, in.05 inch increments.
Missing: INSTRUMENT IS COMPLETE. SOME PAINT LOSS.
Finish: UPPER SURFACES AND SIGHTS PAINTEDBLACK; BLACK STRING FITTED IN ONE SIGHT. NATURAL ALUMINUM FINISH ON UNDERSIDE OF BASE.
Decoration: N/A

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

Raw, J. Frank Co. Ltd., Alidade, circa 1920–1930, Artifact no. 2004.0016, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingeniumcanada.org/en/id/2004.0016.001/

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