Sector

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Ingenium, 1992.1562.001
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OBJECT TYPE: FOLDING/2 ARM
DATE: 1850–1900
ARTIFACT NUMBER: 1992.1562.001

MANUFACTURER: Rowney, G. & Co.
MODEL: Unknown
LOCATION: London, England

More Information

General Information

Serial #: N/A
Part Number: 1
Total Parts: 1
AKA: N/A
Patents: N/A
General Description: BONE WITH BRASS HINGE & PINS, AND SILVER MARKING PINS

Dimensions

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

Length: 16.0 cm
Width: 3.7 cm
Height: N/A
Thickness: N/A
Weight: N/A
Diameter: N/A
Volume: N/A

Lexicon

Group: Marine Transportation
Category: Navigation instruments & equipment
Sub-Category: N/A

Manufacturer

AKA: Rowney
Country: England
State/Province: Unknown
City: London

Context

Country: Canada
State/Province: Ontario
Period: MID 19TH C. +
Canada: ORIGINALLY OWNED BY JOSEPH CROMWELL, OLS. JOHN MCLATCHIE WAS HIS APPRENTICE IN 1864 - SEE MCLATCHIE COLLECTION 780715-780753
Function: CALCULATING INSTRUMENT USED TO SOLVE VARIETY OF MATHEMATICAL PROBLEMS
Technical: SECTORS WERE USED FORDRAWING, MEASUREMENT & CALCULATING PURPOSES AND MAY BE CONSIDERED THE FORERUNNER OF THE SLIDE RULE. BASED ON THE PROPERTIES OF SIMILAR TRIANGLES AND USED WITH A PAIR OF DIVIDERS, THE SECTOR WAS USED TO SOLVE A VARIETY OF PROBLEMS QUICKLY & WITHOUT CALCULATION. ROUTINELY USED BY SURVEYORS IN MID 19TH C
Area Notes: Unknown

Details

Markings: 'G. ROWNEY & CO. LONDON' INCISED ON ONE SIDE. SEVERAL SCALES INCISED ON BOTH FRONT & BACK: SCALES ON ONE SIDE LABELLED (FROM TOP) 'L', 'S', 'C', 'L', 'S', 'C'; ON REVERSE (FROM TOP) 'S', 'T', 'T', 'S', 'T', 'T', WITH SMALL SCALES IN LOWER EDGE LABELLED 'T', 'S', 'N'. SEE ALSO SCALES ON EDGE OF UPPER & LOWER ARMS
Missing: NONE
Finish: NATURAL IVORY COLOUR; LACQUERED BRASS & SILVER FITTINGS
Decoration: 3 6-SIDED STARS INCISED ON LOWER EDGE OF SIDE TWO, AT END OF SCALE. INSET SILVER (?) PINS WITH CENTRE DOT DEFINE PRECISE END POINTS OF SCALES.

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

Rowney, G. & Co., Sector, circa 1850–1900, Artifact no. 1992.1562, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingeniumcanada.org/en/id/1992.1562.001/

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