The description and use of a new astronomical instrument
Subtitle: for taking altitudes of the sun and stars at sea, without an horizon; together with an easy and sure method of observing the eclipses of Jupiter's satellites, or any other phoenomenon of the like kind, on ship-board; ...
Contributors: Smith, Caleb, fl. 1740.
Publisher: printed for G. Strahan, W. Meadows, and J. Clarke, C. Rivington, W. Innys and R. Manby [and 7 others in London]
Published: 1735
Place of publication: London
Language: eng
Format: Microform
Number of pages: 31
Notes: An advertisement for Heath's stock reads "This instrument is made only by Thomas Heath, .. ".

Signed in MS. on p. 20: Willm Ward. Caleb Smith.

Microfilm. Woodbridge, CT Research Publications, Inc., 1986. 1 reel ; 35mm. (The Eighteenth Century ; reel 1534, no. 09).