The ready observator; or an infallible method for determining the latitude at sea: by altitudes of the sun, ... By N. D. Falck.
Falck, N. D.(Nikolai Detlef),1736-1783.
London : printed for the author and sold by Wells and Grosvenor; by the mathematical instrument-makers, and all booksellers in the sea-port-towns in Great Britain,
1771.
With a final advertisement leaf.
The titlepage is engraved.
The text consists mostly of logarithmic tables.
ESTC
Also reproduced on microfilm. Woodbridge, CT: Research Publications, Inc., 1985. The Eighteenth Century ; reel 1394, no. 04.