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  • Thesaurus: navigational instruments
Inch rule
W Bullard
late 20th century
Transparent course protractor
Kelvin & Wilfred O' White Company
before 1948
Plotting protractor
Matthew Berge
c 1809
Aircraft Navigation Square
Ben Lexcen
before 1990
Slide rule Janus series
Blundell Rules Limited
c 1955
Walker's excelsior yacht-log mark iii
Thomas Walker and Son Limited
after 1905
Improved Marine Aneroid Compensated Barometer
Henry Hughes & Son Ltd
1900 - 1941
A2 Harpoon ship's log
Thomas Walker
1866
Boat compass in gimballed box
Heath and Company Limited
before 1988
Brass protractor
Angelo Tornaghi
1894-1904
Pocket compass
Henry Hughes & Son Ltd
c 1950
Pocket compass
Henry Hughes & Son Ltd
c 1940
Triple circle sextant
Henry Hughes & Son Ltd
1850-1900
Ruler
Morcoms Proprietary Limited
1900 - 1950
Inch rule
W H Harling
late 20th century
Brass roller rule encased in wooden box
Kilpatrick and Company
late 20th century
Excelsior Mark IV Traffail ship's log
Walker and Son
20th century