The description and use of a new much-improved sinical quadrant, whereby, a person ... may learn, in six hours, to allow for variation and lee-way, &c. Also, determine the longitude at sea, ... Invented by John Adams, ... and made by Richard Rust, ...
Adams, John,approximately 1730-approximately 1800.
[London] : Skirven, printer, Ratcliff-Highway,
1781.
Includes: 'A journal of a voyage, from the Lizard, towards Madeira, in the Swift, A.B. commander. ..'.
ESTC