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You are here: CollectionsOnline  /  Practical navigation; or, an introduction to the whole art, containing many useful geometrical definitions and problems; the doctrine of plain and spherical triangles; plain Mercator, and great-circle sailing; sundry useful problems in astronomy; the use of instruments; the azimuth-compass and ring-dial. The fore staff, quadrant, and nocturnal; the plian [sic] scale, Gunter's scale, plain-chart, Mercator's-chart, both globes, and virtues of the Loadstone. Useful tables of the moon's age, of the tides, of the sun's place, declination, and right ascension; of the stars right ascension and declination; the latitude and longitude of places, and a table of meridional parts; likewise a new traverse-table, and the use thereof in keeping a reckoning at sea: also a table of 10000 logarithms, and of the logarithm sines, tangents, and secants. All carefully corrected with many useful additions. By John Seller, hydrographer to the King.
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SELLER, John (c. 1632--1697)
Practical navigation; or, an introduction to the whole art, containing many useful geometrical definitions and problems; the doctrine of plain and spherical triangles; plain Mercator, and great-circle sailing; sundry useful problems in astronomy; the use of instruments; the azimuth-compass and ring-dial. The fore staff, quadrant, and nocturnal; the plian [sic] scale, Gunter's scale, plain-chart, Mercator's-chart, both globes, and virtues of the Loadstone. Useful tables of the moon's age, of the tides, of the sun's place, declination, and right ascension; of the stars right ascension and declination; the latitude and longitude of places, and a table of meridional parts; likewise a new traverse-table, and the use thereof in keeping a reckoning at sea: also a table of 10000 logarithms, and of the logarithm sines, tangents, and secants. All carefully corrected with many useful additions. By John Seller, hydrographer to the King.
London:, printed for T. Page, W. and F. Mount,, 1723.
[8], 64, 73--264, [128] p., V fold. pl. : add. etch. t.-p., wdcut illus., tables ; 20.1 cm. (4º)

Seller was an instrument-maker and chart and map seller, and a key figure in establishing a trade in London-printed charts rather than Dutch. This popular textbook was first published in 1669 and continued to be printed until 1739. The additional etched title-page is printed on the verso of the half-title. ESTC n12280.

Copy Notes Inscriptions ink on front free-endpaper: J. Soan[e] / 1767; with calligraphic flourishes: J. Soan[e] / 1767 / London, the 'J' illustrated with a face; John Soan[e] / Ætatis suæ 13¾ / Years, &c, 1767. The final 'e' in all cases added after 1783. Some earlier MS. annotations. Inscriptions in ink on front pastedown: 2/6 second hand with flourishes; in a different hand 5/0 No[vels?]. Three of the diagrams on pl. V are coloured in yellow.

Binding C18th sheep, blind panels, traces of paper spine-label.

Reference Number 511


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