File:Compas_de_proportion_1.jpg
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Summary
DescriptionCompas de proportion 1.jpg |
English: Typical English sector made by the Dollond family firm of London, probably circa early 19th century, constructed of ivory with a brass hinge. This side shows four double scales, repeated on each of the sector's two legs. These scales are the line of lines (labeled L, marked from 1 to 10), a linear scale used for general proportion problems; the line of secants (labeled S, marked in degrees from 20 to 75), for finding the secant of a given angle; the line of chords (labeled C, marked in degrees from 10 to 60), for finding a given angle from a circle of known radius; and the line of polygons (labeled POL, marked from 12 out to 4), for inscribing within a circle a regular-sided polygon of the given number of sides. The L and C scales have their zero point at the sector's hinge; the S scales' zero point is at the 2.5 point on the L scales. Except for the POL scale, all the double scales are arranged so that they form the same-sized angle when the sector is opened a given amount, to make it easier to perform calculations that need more than one scale. A split scale of 12 inches is also present along the outer edges. |
Date | (upload date) |
Source | Own work |
Author | Fgrosshans |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 22:33, 30 October 2007 | 3,868 × 1,072 (823 KB) | Fgrosshans | {{Information |Description= sector (instrument) |Source=travail personnel |Date=30 o |Author= Fgrosshans }} |
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