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The description, use, and excellency of a new instrument, or sea quadrant, invented by Caleb Smith, for taking altitudes of the sun, moon, and stars, from the visible horizon (as well as any other Angular Distances at Land or Sea) without impediment or Interruption from the ship's motion; whereby the Latitude at Sea May be obtained with greater Certainty, and more frequently, than by Davis's or any other of the Common Instruments. Tried, approved, and recommended by Capt. Christopher Middleton, Capt. George Spurrel, Capt. Joseph Harrison, and several other able and experienced Navigators. To which is added, An Essay to make this Quadrant serviceable at Sea, as well as at Land, when there is no Horizon to be seen. As also The Usefulness of its Application to an Aximuth Compass of a New Contrivance for discovering the Variation of the Magnetic Needle, at Sea, without any Astronomical Calculation.
Smith, Caleb, active 1740.Date: [1740?]- Books
Horologiographia: or, The art of dyalling, : being the second book of the use of the trianguler-quadrant. Shewing the natural, artificial, and instrumental way, of making of sun-dials, on any flat superficies: with plain and easie directions, to discover their nature and affections, by the horizontal projection. With the way of drawing the usual ornaments on any plain: also, a familiar easie way to draw those lines on the ceiling of a room, by the trianguler quadrant. Also, the use of the same instrument in navigation; both for observation, and operation. Performing the use of several sea-instruments still in use. / By John Brown, philomath.
Brown, John (Philomath)Date: 1671- Books
The description and use of the trianguler-quadrant : being a particular and general instrument, useful at land or sea; both for observation and operation. More universally useful, portable and convenient, than any other yet discovered. With its uses in arithmetick. Geometry, superficial and solid. Astronomy. Dyalling, three wayes. Gaging. Navigation. In a method not before used. By John Brown, philomath.
Brown, John (Philomath)Date: 1671- Books
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The theory of Hadley's quadrant demonstrated; and from thence its nature, construction, and uses are fully shewn. With a table of the sun's declination for finding the latitude of the place. To which is added, a new construction of the quadrant, which, by Means of an artificial Horizon, renders it of universal Use by Sea and Land. By Benj. Martin.
Martin, Benjamin, 1705-1782.Date: [1760?]- Books
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The description and uses of the celestial and terrestrial globes, and of Collins's pocket-quadrant / By John Harris.
Harris, John, 1667?-1719.Date: 1710