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Image
Has Image
4
Non-Commercial Use
4
Category
Navigation
3
Astronomy
1
Maker
Gilbert, John
1
Gilbert, John; Science Museum, Workshops
1
James Woodside
1
Jno Gilbert, John
1
John Gilbert
1
Jonathan Sisson
1
Science Museum, Workshops
1
Sisson, Jonathan
1
Woodside, James
1
Object type
back-staff
4
artificial horizon
1
back-staff; artificial horizon
1
Place
Tower Hill
2
Tower Hill, City of London, England, United Kingdom
2
Dublin
1
Dublin, Leinster, Ireland
1
Strand
1
Strand, City of Westminster, London, England, United Kingdom
1
Material
boxwood
3
glass
2
brass (copper, zinc alloy)
1
ebony
1
ivory
1
mahogany
1
wood (unidentified)
1
Date
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To
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Wooden backstaff.
1759
Wooden backstaff or Davis quadrant made by John Gilbert on Tower Hill
1730; 1967
Wooden backstaff.
1733
Wooden backstaff fitted with artificial horizon.
1730-1735
