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2. Compass (drawing tool) - Wikipedia

   en.wikipedia.org/wiki/Compass_(drawing_tool)

   A beam compass and a regular compass Using a compass A compass with an extension accessory for larger circles A bow compass capable of drawing the smallest possible circles. A compass, also commonly known as a pair of compasses, is a technical drawing instrument that can be used for inscribing circles or arcs.

3. Straightedge and compass construction - Wikipedia

   en.wikipedia.org/wiki/Straightedge_and_compass...

   The compass can have an arbitrarily large radius with no markings on it (unlike certain real-world compasses). Circles and circular arcs can be drawn starting from two given points: the centre and a point on the circle. The compass may or may not collapse (i.e. fold after being taken off the page, erasing its 'stored' radius).

4. History of the compass - Wikipedia

   en.wikipedia.org/wiki/History_of_the_compass

   A bearing compass is a magnetic compass mounted in such a way that it allows the taking of bearings of objects by aligning them with the lubber line of the bearing compass. [79] A surveyor's compass is a specialized compass made to accurately measure heading of landmarks and measure horizontal angles to help with map making .

5. Beam compass - Wikipedia

   en.wikipedia.org/wiki/Beam_compass

   A beam compass is a compass with a beam and sliding sockets or cursors for drawing and dividing circles larger than those made by a regular pair of compasses. [1] The instrument can be as a whole, or made on the spot with individual sockets (called trammel points) and any suitable beam.

6. Perdix (mythology) - Wikipedia

   en.wikipedia.org/wiki/Perdix_(mythology)

   Perdix (Ancient Greek: Πέρδιξ meaning "partridge" [1]) was a nephew and student of Daedalus in Greek mythology, claimed to have invented the potter's wheel, the saw, and the compass. In other sources, Perdix was the name of Daedalus's sister, and her inventor son was named Talos or Attalus. [2]

7. Compass equivalence theorem - Wikipedia

   en.wikipedia.org/wiki/Compass_equivalence_theorem

   In geometry, the compass equivalence theorem is an important statement in compass and straightedge constructions.The tool advocated by Plato in these constructions is a divider or collapsing compass, that is, a compass that "collapses" whenever it is lifted from a page, so that it may not be directly used to transfer distances.