The triangular quadrant, or, The quadrant on a sector being a general instrument for land or sea observations : performing all the uses of the ordinary sea instruments, as Davis quadrant, forestaff, crosstaff, bow, with more ease, profitableness, and conveniency, and as much exactness as any or all of them : moreover, it may be made a particular and a general quadrant for all latitudes, and have the sector lines also : to which is added a rectifying table to find the suns true declination to a minute or two, any day or hour of the 4 years : whereby to find the latitude of a place by meridian, or any two other altitudes of the sun or stars / first thus contrived and made by John Brown ...
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Title
The triangular quadrant, or, The quadrant on a sector being a general instrument for land or sea observations : performing all the uses of the ordinary sea instruments, as Davis quadrant, forestaff, crosstaff, bow, with more ease, profitableness, and conveniency, and as much exactness as any or all of them : moreover, it may be made a particular and a general quadrant for all latitudes, and have the sector lines also : to which is added a rectifying table to find the suns true declination to a minute or two, any day or hour of the 4 years : whereby to find the latitude of a place by meridian, or any two other altitudes of the sun or stars / first thus contrived and made by John Brown ...
Author
Brown, John, philomath.
Publication
[London] :: To be sold at [his, i.e. Brown's] house, or at Hen. Sutton's ...,
1662.
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Subject terms
Quadrant.
Dialing.
Mathematical instruments.
Cite this Item
"The triangular quadrant, or, The quadrant on a sector being a general instrument for land or sea observations : performing all the uses of the ordinary sea instruments, as Davis quadrant, forestaff, crosstaff, bow, with more ease, profitableness, and conveniency, and as much exactness as any or all of them : moreover, it may be made a particular and a general quadrant for all latitudes, and have the sector lines also : to which is added a rectifying table to find the suns true declination to a minute or two, any day or hour of the 4 years : whereby to find the latitude of a place by meridian, or any two other altitudes of the sun or stars / first thus contrived and made by John Brown ..." In the digital collection Early English Books Online. https://name.umdl.umich.edu/A29764.0001.001. University of Michigan Library Digital Collections. Accessed May 3, 2024.
Pages
II. To find the Suns or a Stars Altitude, by a forward Observation.
Skrew the turning sight to the head Cen∣ter, and set that object sight, whose holes answer to the Sliding horizon sight, in the hole at the end of the head leg, and put the horizon sight on the crosse peece next the inside; Then holding the crosse peece with your right hand, and the turn∣ing sight close to your eye, and the movea∣ble leg against your body, with your thumb
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on the right hand thrust upwards, or pull downwards, the horizon sight: till you see the sun through the object sight, and the horizon through the horizon sight, then the degrees cut by the middle of the hori∣zon sight, on the crosse peece shall be the true altitude required:
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