Twelve inch astronomical quadrant by Bird

Made:
1760-1769 in London
maker:
John Troughton
Twelve inch astronomical quadrant by Bird

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Science Museum Group Collection
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Twelve inch astronomical quadrant by Bird, employed in the observations of the transit of Venus in 1769, at Schiehallion 1774-76, with case and key, subsequently repaired and redivided by "Troughton" engraved "R.S 63" on stand with 4 levelling screws, cleaned and relacquered, October 1951

Details

Category:
Astronomy
Object Number:
1900-138
Materials:
brass and steel
Measurements:
overall: 640 x 430 x 250 mm
type:
quadrant - optical and instrument case
credit:
The Royal Society

Parts

Case for 12-inch astronomical quadrant by Bird, employed in the observations of the transit of Venus in 1769 and at schiehallion 1774-76

Case for 12-inch astronomical quadrant by Bird

Case for 12-inch astronomical quadrant by Bird, employed in the observations of the transit of Venus in 1769 and at schiehallion 1774-76

Measurements:
case: 230 x 490 x 480 mm
Materials:
mahogany and fittings brass
Object Number:
1900-138 Pt1
type:
instrument case
Twelve inch astronomical quadrant by Bird, employed in the observations of the transit of Venus in 1769, at Schiehallion 1774-76,

John Bird's Twelve inch astronomical quadrant

Twelve inch astronomical quadrant by Bird, employed in the observations of the transit of Venus in 1769, at Schiehallion 1774-76,

Measurements:
overall: 640 x 430 x 250 mm
Materials:
brass (copper, zinc alloy) and steel (metal)
Object Number:
1900-138 Pt2
type:
optical quadrant - measuring device

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