The description and use of an instrument called the dovble scale of proportion by which instrument, all questions in arithmetick, geometry, trigonometry, astronomy, geography, navigation, fortification, gunnery, gaging vessels, dialling may be most accurately and speedily performed without the assistance of either pen or compasses - Partridge, Seth 1603-1686 (Printed by William Leybourn for William Wright, 1661)
Advertisement: p. 188. - Errors in paging: p. 7-8 omitted in numbering only; p. 55 misprinted 57. - Reproduction of the original in the Huntington Library. - Wing, P630A