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Keuffel & Esser Arrow Beam Compass Set for Drafting. A draftsman's beam compass consists of a set of points and holders, mounted on a plated brass, aluminum, or German 'silver' [2] [3] rod. One end is generally locked down at the end of the rod, while the other has both rough and fine adjustments, though some are opposite in construction.
It consists of a metal tin embossed on the front with a drawing of Balliol College and the words 'THE HELIX OXFORD SET OF MATHEMATICAL INSTRUMENTS COMPLETE & ACCURATE' in white against a blue background. Inside the tin there are two set squares, a 180° protractor, a 15 cm ruler, a metal compass, a 9 cm pencil, a pencil sharpener, and an eraser.
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.
A half-circle protractor marked in degrees (180°). A protractor is a measuring instrument, typically made of transparent plastic, for measuring angles. Some protractors are simple half-discs or full circles. More advanced protractors, such as the bevel protractor, have one or two swinging arms, which can be used to help measure the angle.
The Oxford Set of Mathematical Instruments is a set of instruments used by generations of school children in the United Kingdom and around the world in mathematics and geometry lessons. It includes two set squares, a 180° protractor, a 15 cm ruler, a metal compass, a metal divider, a 9 cm pencil, a pencil sharpener, an eraser and a 10mm stencil.
In the 19th century a retired sea captain, Captain William Andrew Field [Note 1] improved the design by adding a protractor-style scale to the upper edge of one rule, and compass points to the opposing edge, which made reading bearings easier. [2] Examples exist of boxwood, ivory or ebony, usually with brass hinges.