Rule, parallel

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OBJECT TYPE: 2 RULE/46 CM
DATE: 1900–1940
ARTIFACT NUMBER: 2004.0015.001

MANUFACTURER: Crabtree, H.S. 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: BRASS

Dimensions

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

Length: 46.1 cm
Width: 6.8 cm
Height: 2.0 cm
Thickness: N/A
Weight: N/A
Diameter: N/A
Volume: N/A

Lexicon

Group: Mathematics
Category: Drawing & measuring instruments
Sub-Category: N/A

Manufacturer

AKA: Crabtree
Country: Canada
State/Province: Ontario
City: Toronto

Context

Country: Canada
State/Province: Unknown
Period: USED IN 20TH C.
Canada: PARALLEL RULE WAS AMONG SURVEY & DRAFTING INSTRUMENTS COLLECTED BY MR. LOU SEBERT, A TOPOGRAPHICAL SURVEYOR AND MAPPER WHO WORKED FOR THE CDN ARMY'S SURVEY & MAPPING DIVISION, AND WITH THE STAFF OF THE TOPOGRAPHICAL SURVEY OF CANADA. HE AUTHORED MANY PAPERS AND WAS CO-EDITOR OF 'MAPPING A NORTHERN LAND' (1999). THIS RULE MFD IN TORONTO BY H.S. CRABTREE IN 1ST HALF OF 20THC. (REF. 1)
Function: USED TO DRAW PARALLEL LINES, TO SCALE.
Technical: THIS PARALLEL RULE IS SLIGHTLY LONGER AND HEAVIER THAN AVERAGE. IT BEARS BOTH DEGREE MARKINGS (DIVIDED TO 1-DEGREE), AND COMPASS DIRECTIONS.
Area Notes: Unknown

Details

Markings: "H.S. CRABTREE LIMITED/ TORONTO" stamped on surface of lower rule. Adjacent scales on upper rule divided 10-170 and 190 to 350; labelled at intervals of 10. "NW", fleur-de-lis [symbol for North] and "NE" stamped on upper rule. Scales onlower rule are divided but not labelled. Compass directions "SW", "S" and "SE" stamped on lower rule.
Missing: NONE.
Finish: LACQUERED BRASS.
Decoration: N/A

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

Crabtree, H.S. Ltd., Rule, parallel, circa 1900–1940, Artifact no. 2004.0015, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingeniumcanada.org/en/id/2004.0015.001/

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