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Two wooden yardsticks with brass ends, in inches and division of yard for half, quarter, eighth and sixteenth A folding metre-stick carpenter's ruler with millimetre divisions and numbers in centimetres. Fully extended it measures 2 metres. In countries in which the metric system is used, the scale typically contains only a metric scale.
A variety of rulers A carpenter's rule Retractable flexible rule or tape measure A closeup of a steel ruler A ruler in combination with a letter scale. A ruler, sometimes called a rule, scale or a line gauge or metre/meter stick, is an instrument used to make length measurements, whereby a length is read from a series of markings called "rules" along an edge of the device. [1]
In 1851 Anton Ullrich invented the folding ruler, and in 1887 obtained the patent for the springed hinge of the folding ruler. The "Gebrüder Ullrich" company expanded quickly and later built another factory site in the neighbouring village of Kirrweiler .
Robert Gair was a Scottish printer and paper bag maker who invented the folding carton in 1879. [1] Born in Edinburgh, Scotland in 1839, he emigrated to the United States at age 14. Gair invented the paperboard folding carton by accident when a metal ruler
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The C-Thru Ruler Company is an American maker of measuring devices and specialized products for drafting, designing and drawing. The company was formed in 1939 in Bloomfield, Connecticut , [ 1 ] by Jennie R. Zachs, a schoolteacher, who saw the need for transparent measuring tools such as rulers , triangles , curves and protractors .
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The most common and convenient arrangement was to have one of the rulers slide within a groove made along the middle of the other, like an ordinary linear slide rule, as shown in the figure below. Another form had one ruler sliding alongside the other, and a third form had a common two-foot folding ruler with a groove along one side in which a ...
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