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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 the late 1920s, carpenters began slowly adopting H. A. Farrand's design as the one more commonly used. Farrand's new design was a concave/convex tape made of metal which would stand straight out a distance of four to six feet. This design is the basis for most modern pocket tape measures used today.
The Swiss Army Knife was not the first multi-use pocket knife. In 1851, in Moby-Dick (chapter 107), Herman Melville mentions the "Sheffield contrivances, assuming the exterior – though a little swelled – of a common pocket knife; but containing, not only blades of various sizes, but also screwdrivers, cork-screws, tweezers, bradawls, pens, rulers, nail files and countersinkers."
BG42 is a domestic alloy steel. It is an aeronautics bearing-grade composition with added carbon and vanadium. 154CM. 154-CM is an American-made stainless alloy. It combines three principal elements: carbon, chromium, and molybdenum. Added levels of carbon and chromium are also used. Re-sharpening can require extra effort, but is needed less often.
The SwissCard is roughly the size of a business card, typically with a small pair of scissors, a short non-folding knife, a small file with a screwdriver point, a plastic toothpick, tweezers, a slim ballpoint pen, and a straight pin, housed in a hard plastic case of 82 × 54.5 x 4.5 mm in size, with an inch ruler on one side and metric ...
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