Compass (drafting) | Wikipedia audio article
Channel: wikipedia tts
Date: 15/01/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Compass_(drawing_tool)


00:01:00 1 Construction and parts
00:01:25 1.1 Handle
00:01:41 1.2 Legs
00:02:05 1.3 Hinge
00:02:24 1.4 Needle point
00:02:39 1.5 Pencil lead
00:02:58 1.6 Adjusting nut
00:03:11 2 Uses
00:03:54 3 Compasses and straightedge
00:04:46 4 Variants
00:06:12 5 As a symbol
00:06:41 6 See also



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SUMMARY
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A pair of compasses, also known simply as a  bow compass, is a technical drawing instrument that can be used for inscribing circles or arcs. As dividers, they can also be used as tools to measure distances, in particular on maps. Compasses can be used for mathematics, drafting, navigation and other purposes.
Compasses are usually made of metal or plastic, and consist of two parts connected by a hinge which can be adjusted to allow the changing of the radius of the circle drawn. Typically one part has a spike at its end, and the other part a pencil, or sometimes a pen.
Prior to computerization, compasses and other tools for manual drafting were often packaged as a "bow set" with interchangeable parts. By the mid–twentieth century, circle templates supplemented the use of compasses. Today these facilities are more often provided by computer-aided design programs, so the physical tools serve mainly a didactic purpose in teaching geometry, technical drawing, etc.