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