Arc, sighting

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Ingenium, 1995.0671.001
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OBJECT TYPE: N/A
DATE: 1880–1910
ARTIFACT NUMBER: 1995.0671.001

MANUFACTURER: Unknown
MODEL: Unknown
LOCATION: England

More Information

General Information

Serial #: N/A
Part Number: 1
Total Parts: 1
AKA: N/A
Patents: N/A
General Description: BRASS CONSTRUCTION, SAVE ARC SCALE FACE & READING INDICATOR WHICH ARE PROBABLY DIVIDED ON SILVER

Dimensions

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

Length: 19.0 cm
Width: 19.0 cm
Height: 15.3 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: Unknown
Country: England
State/Province: Unknown
City: Unknown

Context

Country: Unknown
State/Province: Unknown
Period: THIS TYPE OF INSTRUMENT PROBABLY USED C. LATE 19TH-EARLY 20TH CENTURIES
Canada: NONE SPECIFICALLY. INSTRUMENTS SUCH AS THIS COULD HAVE BEEN USED IN CANADIAN MINES.
Function: TO DETERMINE SLOPE OF MINE SHAFTS, WHEN USED WITH COMPASS OR CIRCUMFERENTOR-TYPE SURVEY INSTRUMENT
Technical: DEVICE DESIGNED SPECIFICALLY FOR MINE SURVEYING, AS EVIDENCED BY SCALE. ARC WOULD BE MOUNTED ON A COMPASS OR CIRCUMFERENTOR FITTED WITH BUBBLE LEVELS. THE ARC WOULD HAVE BEEN SIGHTED UP OR DOWN A MINE SHAFT & THE COMPASS LEVELLED WITH THE BUBBLES. THE READING THEN PROVIDED THE GRADE, IN FEETIN A FATHOM (6 FT) (PER RCB)
Area Notes: Unknown

Details

Markings: ARC DIVIDED +5-0-5+ FEET BY 1-INCH INCREMENTS ON INNER EDGE; OUTER EDGE DIVIDED +1-6-1+ FEET BY 1-INCH INCREMENTS. INNER SCALE LABELLED 'Perpr' AT EITHER END; 'FOOT' INCISED ON EITHER SIDE OF '0'. OUTER SCALE LABELLED 'FOOT' ON EITHER END; 'Underlie in a Fathom' INCISED IN CENTRAL PORTION OF ARC.
Missing: SCREW FITTING LEFT SIGHT TO ARC NOT ORIGINAL. CROSSHAIRS IN BOTH SIGHTS BROKEN BUT PRESENT. LEFT SIGHT VANE MAY ALSO BE REPLACEMENT, AS IT IS DIFFERENTLY CONFIGURED AT ATTACHMENT POINT, DESIGN RE: FOLDING MOVEMENT *
Finish: ALL SURFACES SAVE FACE OF SCALE HAVE OXIDIZED BRASS FINISH. SCALE FACE HAS THIN LACQUERED FINISH APPLIED. CENTRAL PIVOT FITTING & ATTACHMENT SCREWS ALL HAVE LACQUERED BRASS FINISH
Decoration: N/A

CITE THIS OBJECT

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

Unknown Manufacturer, Arc, sighting, between 1880–1910, Artifact no. 1995.0671, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingenium.ca/en/id/1995.0671.001/

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