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Expired
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Percy Alliott Smithurst
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Individual
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Individual
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Publication of GB191207589ApublicationCriticalpatent/GB191207589A/en
7589. Smithurst, P. A. March 28. Sextants &c. - To facilitate coarse and fine adjustments in sextants &c., a device is employed which on the pressing together of two thumb-pieces f, g causes the release of a friction device engaging the sector &c. k and permitting movement of the radius bar a &c. As shown, the means comprise a spring- pressed plunger o withdrawn on operation of the pieces f, g by a surface x riding up a surface w. In a modification, a quick-threaded screw is withdrawn from engagement with a clamping-surface.
GB191207589D1912-03-281912-03-28Improvements in or relating to Sextants and other like Apparatus.
ExpiredGB191207589A
(en)