Category:Sector (instrument)
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English: The sector (sometimes called a proportional compass, although this term is also used for the reduction compass) was described in Gunters book of 1623. It is a mathematical instrument which consists of two hinged rulers with engraved scales, that allow questions in trigonometry to be solved. They were always used with dividers. On the wooden sector there are brass locating pins where the divider points rest. To obtain the measure of an angle, place the dividers (transversely) on the locating pins on the Line of Chords pins, then the distance established transfer the dividers to the Line of Chords, one leg on the centre mark- the other leg will read off the angle. Gunters sector also had logarithmic scales so could be used to multiply. Edward Gunter and his Sector, 2003, C.J.Sagwin
Subcategories
This category has the following 2 subcategories, out of 2 total.
P
S
- Sector-MHS 147 (3 F)
Media in category "Sector (instrument)"
The following 37 files are in this category, out of 37 total.
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A treatise of such mathematical instruments Fleuron T092497-1.png 2,049 × 2,633; 255 KB
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London National Gallery Cognoscenti in a Room hung with Pictures 02.jpg 5,184 × 3,888; 4.49 MB
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Compas de proportion 1.jpg 3,868 × 1,072; 823 KB
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Compas de proportion 2.jpg 3,914 × 1,120; 937 KB
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Elliott Sector.jpg 1,024 × 564; 116 KB
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Galileo galilei, compasso geometrico e militare, 1606 ca..JPG 1,698 × 984; 325 KB
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Galileo's geometrical and military compass in Putnam Gallery, 2009-11-24.jpg 3,473 × 1,955; 1.69 MB
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Galileo's geometrical and military compass in Putnam Gallery, detail 1, 2009-11-24.jpg 3,888 × 2,592; 2.51 MB
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Galileo's geometrical and military compass in Putnam Gallery, detail 2, 2009-11-24.jpg 3,722 × 2,094; 1.86 MB
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Galileo, his life and work (1903) (14580148127).jpg 2,736 × 1,398; 253 KB
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Galileo-lodestone-150-768x835.png 768 × 835; 1.28 MB
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Gunter's Scale Sector - MIT Slide Rule Collection - DSC03579.JPG 3,898 × 2,970; 2.33 MB
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Henrion - Usage du compas de proportion, 1637 - BEIC 218820 F.jpg 753 × 1,265; 188 KB
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Le Operazioni del Compasso Geometrico et Militare (1649) (14767987455).jpg 3,440 × 2,280; 1.59 MB
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Manesson-Travaux-de-Mars 9546.tif 3,320 × 5,064; 48.14 MB
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MIC Torino-Compasso di proporzione-640.png 640 × 640; 299 KB
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Pagnini - Costruzione ed uso del compasso di proporzione, 1758 - 4628400.tif 1,780 × 2,674; 13.91 MB
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Proportional compass (line art) (PSF S-820008 (cropped)).png 3,850 × 1,707; 4.48 MB
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Proportionalcirkel av mässing - Skoklosters slott - 92885.tif 3,797 × 2,076; 22.57 MB
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PSF S-820008.png 5,072 × 5,872; 13.29 MB
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Sector 20-OA 10804-IMG 3620.JPG 1,706 × 697; 145 KB
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Sector Ruler (PSF).png 3,648 × 1,608; 330 KB
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Sector, Elliott Brothers Ltd., UK, ca. 1854.agr.jpg 3,072 × 714; 1.05 MB
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Use of compasses by Galileo Galilei.jpg 1,008 × 1,378; 812 KB
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Usus et Fabrica Circini Cuiusdam Proportionis (1655) (14784263703).jpg 1,540 × 3,224; 982 KB
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Логарифмические линейки.jpg 2,742 × 1,800; 4.98 MB
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Манжен, Клеман.png 800 × 599; 737 KB