A treatise of such mathematical instruments, as are usually put into a portable case : Shewing some of their uses in arithmetic geometry, trigonometry, spherics, architecture, surveying, geography, perspective, &c., with an appendix containing the description and use of the gunners callipers. And the description of, and precepts for the delineation of, ship-guns and sea mortars. To this treatise, is prefixed a brief account of authors, who have wrote on the proportional compasses and sector by John Robertson
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