The theory and construction of Hadley's quadrant demonstrated: and also all the necesary directions given for adjusting the glasses, and using it for taking the altitude of the sun, moon, and stars, for finding the latitude at sea ...
Subtitle: To which is added, correct tables of the sun's declination ... a table of refraction, &c., &c
Publisher: Printed for Gregory and Wright, mathematical instrument makers
Published: 1795
Place of publication: London
Language: eng
Number of pages: 28
Notes: Apparently written by G. Wright (cf. p. 12, 22 and 27) and published after 1783.

Date from British Museum Catalogue.

"The following instruments are made and sold by Gregory, and Wright, Mathematical, Optical, Philosophical, and Nautical Instrument Makers ... London": p. 26-28.