The magnetic atlas, or, Variation charts of the whole terraqueous globe
Subtitle: comprising a system of the variation and dip of the needle, by which the observations being truly made, the longitude may be ascertained
By: by John Churchman
Publisher: Printed for the author, by Darton and Harvey, and sold by John Sewell ... Charles Dilly ... T. and J. Egerton ... James Phillips ... and Steel and Son ...
Published: 1794
Place of publication: London
Language: eng
Number of pages: 80
Subjects: Geomagnetism; Diurnal variations; Early works to 1800; Longitude
Other titles: Variation charts of the whole terraqueous globe.
Notes: Signatures: A-L⁴.

A shorter version was published in 1790, with title: An explanation of the magnetic atlas, or variation chart, hereunto annexed.

"History of magnetic discoveries": p. [i]-xxix.