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Non-Commercial Use
5
Category
Navigation
3
Mathematics
2
Photographs
1
Collection
Sir Henry Wellcome's Museum Collection
1
Object type
back-staff
2
octant
1
photograph
1
rule (calculating)
1
slide rule
1
Maker
Gilbert & Gilkerson
2
Gilbert and Gilkerson
2
Gilbert, John
2
Jno Gilbert, John
2
Gilbert, John; Science Museum, Workshops
1
John Gilbert
1
Science Museum, Workshops
1
Trainer, David
1
Place of origin
Tower Hill
6
Tower Hill, City of London, England, United Kingdom
3
Tower Hill, City of London, London, Greater London, England, United Kingdom
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Wooden backstaff or Davis quadrant made by John Gilbert on Tower Hill
1730; 1967
Wooden backstaff.
1759
Mahogany and brass octant.
1764
Slide rule of boxwood (24 in) with two sliders
1793-1809
Wooden rule with two stepped inch scales
1800
Photograph by David Trainer: Tower Hill London Faiths, 2005.
Tower Hill London Faiths
2005
