The description and use of the current logg; or, an instrument to try a current when a ship is under sail; ... To which is added, the use of Hadley's quadrant. ... By William Orcherton, ...
Orcherton, William.
London : printed for the author, and J. Millan,
1764.
Pp.[19,20] are blank.
The final leaf contains 'Directions to sailors, travellors, or collectors of rarities'.
ESTC