An explanation of the magnetic atlas, or variation chart, hereunto annexed
Subtitle: projected on a plan entirely new, by which the magnetic variation on any part of the globe may be precisely determined, for any time, past, present, or future : and the variation and latitude being accurately known, the longitude is of consequence truly determined
By: by John Churchman, late land surveyor for the district of the counties of Delaware and Chester, and for part of Lancaster and Berks, Pennsylvania.
Contributors: Force, Peter, 1790-1868, former owner.; Toner, Joseph M. 1825-1896, former owner.; American Imprint Collection (Library of Congress); Marian S. Carson Collection (Library of Congress); Benjamin Franklin Collection (Library of Congress); Thomas Jefferson Library Collection (Library of Congress)
Publisher: Printed by James & Johnson ...
Published: 1790
Place of publication: Philadelphia
Language: eng
Number of pages: 46
Subjects: Geomagnetism -- Early works to 1800.
Genres: Early works to 1800.
Notes: Evans 22406
Sowerby, E.M.  Cat. of the lib. of Thomas Jefferson, 669
Signatures: [A]⁴ B-F⁴ G².
Subscriber's names: p. vi-x.
Errata: p. [1] at end.
LC copy has 4 p. prospectus for the London ed. (published 1794) bound in.
With: Churchman, John. To George Washington, President of the United States of America, this magnetic atlas or variation chart, is humbly inscribed. [Philadelphia] : Published according to Act of Congress, 1790. Probably issued together.