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Metal is also used for more durable rulers for use in the workshop; sometimes a metal edge is embedded into a wooden desk ruler to preserve the edge when used for straight-line cutting. 12 in or 30 cm in length is useful for a ruler to be kept on a desk to help in drawing. Shorter rulers are convenient for keeping in a pocket. [2]
Euler's Disk, invented between 1987 and 1990 by Joseph Bendik, [ 1] is a trademarked scientific educational toy. [ 2] It is used to illustrate and study the dynamic system of a spinning and rolling disk on a flat or curved surface. It has been the subject of several scientific papers. [ 3]
1921–1968. During and after World War II the company continued to produce thousands of rulers and other measuring instruments . After remaining in family hands for 96 years, the Westcott Rule Co. was sold in 1968 to Acme Shear Company of Bridgeport, Connecticut, which was a manufacturer of shears and medical equipment.
Orak, ruler of the Phants in the Dan Dare story "Rogue Planet" (1955) Brainiac, an enemy of Superman, sometimes depicted as a humanoid computer (1958) (DC Comics) Batcomputer, the computer system used by Batman and housed in the Batcave (1964) (DC Comics)
Rulers come in two types according to the design of their edge. A ruler with a straight edge can be used with lead pencils and felt pens, whereas when a technical pen is used the edge must be grooved to prevent the spread of the ink. An architect's scale. A scale ruler is a scaled, three-edged ruler which has six different scales marked to its ...
t. e. In geometry, straightedge-and-compass construction – also known as ruler-and-compass construction, Euclidean construction, or classical construction – is the construction of lengths, angles, and other geometric figures using only an idealized ruler and a pair of compasses . The idealized ruler, known as a straightedge, is assumed to ...
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