An explanation of the magnetic atlas or variation chart, hereunto annexed : 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

The plates are tables.
Signatures: [A]⁴ B-F⁴ G².
Sowerby, E.M. Cat. of the lib. of Thomas Jefferson, 669
Evans 22406
ESTC W32217
Subscribers' list: p. vi-x.
Errata: p. [1] at end.
Chart issued separately with title or dedication: To George Washington, president of the United States of America, this Magnetic atlas or Variation chart, is humbly inscribed by John Churchman. Cf. copyright entry preceding preface.
With: Proposals for publishing by subscription the Magnetic atlas or variation charts of all the world. [London : s.n., 1782?]. Issued separately.
Also available in digital form on the Library of Congress Web site.
QC814.C55 Copy 1 transferred from the American Imprint Collection to the Jefferson Exhibit Collection. he04 2013-04-10
QC814.C55 Copy 5 transferred from the Toner Collection to the Benjamin Franklin Collection.
LAC REVIEW COMPLETED 2018-08-15 SC
LAC kcc 2018-08-24
LAC Review Completed 2018-08-24
LC Review of LAC Completed/Corrections Sent 2018-08-30