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  • Thesaurus: navigational instruments
Plotting protractor
Matthew Berge
c 1809
Slide rule Janus series
Blundell Rules Limited
c 1955
Walker's excelsior yacht-log mark iii
Thomas Walker and Son Limited
after 1905
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
Double framed sextant
Troughton and Simms
1810 - 1860
Triple circle sextant
Henry Hughes & Son Ltd
1850-1900
Excelsior Mark IV Traffail ship's log
Walker and Son
20th century
Ruler
Morcoms Proprietary Limited
1900 - 1950
Inch rule
W Bullard
late 20th century
Inch rule
W H Harling
late 20th century
Brass roller rule encased in wooden box
Kilpatrick and Company
late 20th century
Transparent course protractor
Kelvin & Wilfred O' White Company
before 1948