Concept
Quadrants (Astronomical instruments)
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The sector on a quadrant, or, a treatise containing the description and use of four several quadrants; two small ones and two great ones, each rendred many wayes, both general and particular. Each of them accomodated for dyalling; for the resolving of all proportions instrumentally; and for the ready finding the hour and azimuth universally in the equal limbe. Of great use to seamen and practioners in the mathematicks / Written by John Collins accountant philomath. Also an appendix touching reflected dyalling [by J. Lyon] From a glass placed at any reclination.
Collins, John, 1625-1683.Date: 1659
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MS Arabic 593
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The nature and use of Hadley's quadrant, with a preface containing the theory, on which that noble and useful instrument is founded. And a description of the nonius.
Date: 1790?]- Books
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The description and use of a portable instrument, vlugarly [sic] known by the name of Gunters quadrant : by which is perform'd most propositions in astronomy, as the altitude, azimuth, right ascention, and declination of the sun, &c. : also his rising, and setting and amplitude, together with the hour of the day or night, and other condusions exemplified at large : to which is added the use of Nepiars bones in multiplication, division, and extraction of roots, also the the nocturnal, the ring dial, and Gunters-line, in many necessary and delightful conclusions, fitted to the understanding of the meanest capacity : collected and digested into this portable volumn, for the use of young practitioners / by a true lover of the mathematicks.
Gunter, Edmund, 1581-1626Date: 1685- Books
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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?]