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Vernier Sextant with additional monocular : Captain H W Bolles
Technology
Maker: D McGregor & Co. Greenock & Glasgow
Vernier sextant with additional monocular. The frame and the arc of the sextant are brass. Along the top of the arc are imprinted the gradations ranging from 0 to 150 with a steel runner inlaid undern...REL38857