The description and use of a new sea quadrant, for taking the altitude of the sun from the visible horizon
Subtitle: which is so contrived, that the observer will be liable to no interruption, or inaccuracy from the ship's motion : and the latitude at sea may be obtained with greater certainty, and more frequently than by any instrument of the like kind hitherto made publick
By: invented, made, and sold by George Adams ... ; to which is added The description and use of two curious methods for procuring an artificial horizon at sea, to be used with Hadley's Quadrant ...
Publisher: Printed by John Hart
Published: 1748
Place of publication: London
Language: eng
Number of pages: 40
Subjects: Quadrants (Astronomical instruments); Navigation; Early works to 1800
Notes: ESTC T18679