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 bein accurately known, the longitude is of consequence truly determined. By John Churchman, late land surveyor for the district of the counties of Delaware and Chester, and for part of Lancaster and Berks, Pennsylvania
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| Other Authors: | , |
| Format: | eBook |
| Language: | English |
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Philadelphia
Printed by James & Johnson, on the north side of Market-Street, between Third and Fourth-Streets
1790, M,DCC,XC. [1790]
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| Collection: | Eighteenth Century Collections Online / ECCO - Collection details see MPG.ReNa |
| Item Description: | "Errata."--p. [6]. - English Short Title Catalog, W32217. - Evans, 22406. - Reproduction of original from British Library. - Subscribers names come to hand."--p. vi-ix. - The variation chart was also issued separately and dedicated to George Washington |
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| Physical Description: | Online-Ressource (x, [3], 14-46, 5, [1] p., [3] folded leaves of plates) ill 8° |