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A modern military compass, with included sight device for aligning. A compass is a device that shows the cardinal directions used for navigation and geographic orientation. It commonly consists of a magnetized needle or other element, such as a compass card or compass rose, which can pivot to align itself with magnetic north.
There are primarily two types of iron-on labels: a form of material tape; and a form of vinyl similar to that used on graphic t-shirts. With the vinyl type the objective is to effectively melt the label onto the cloth so the label and garment become one, hence a permanent bond. The application of a label typically takes about 10–15 seconds ...
Thomas Skinner (16 June 1819 – 6 December 1881) was an etcher, inventor and amateur oil-painter in Sheffield, West Riding of Yorkshire, England.During the 1840s he invented a method by which the mass production of etched designs on steel blades could be facilitated by means of paper transfers.
It combined a compass with a protractor built into the base. His design featured a metal compass capsule containing a magnetic needle with orienting marks mounted into a transparent protractor baseplate with a lubber line (later called a direction of travel indicator). By rotating the capsule to align the needle with the orienting marks, the ...
He hung a compass-needle within rings of different materials, pushed the needle aside to about 45°, and counted the number of oscillations made by the needle before the angle of swing decreased to 10°. In a wooden ring the number was 145, in a thin copper ring 66, and in a stout copper ring it was only 33.
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Compasses are usually made of metal or plastic, and consist of two "legs" connected by a hinge which can be adjusted to allow changing of the radius of the circle drawn. . Typically one leg has a spike at its end for anchoring, and the other leg holds a drawing tool, such as a pencil, a short length of just pencil lead or sometimes a
A circumferentor consists of a circular brass box containing a magnetic needle, which moves freely over a brass circle, or compass divided into 360 degrees. [1] [2] The needle is protected by a glass covering. [2] A pair of sights is located on the North-South axis of the compass. [1]
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