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In mathematics and physics, the plate trick, also known as Dirac's string trick (after Paul Dirac, who introduced and popularized it), [1] [2] the belt trick, or the Balinese cup trick (it appears in the Balinese candle dance), is any of several demonstrations of the idea that rotating an object with strings attached to it by 360 degrees does not return the system to its original state, while ...
Olympia Looping, also known as Munich Looping, is a portable steel roller coaster owned and operated by R. Barth und Sohn Schaustellerbetriebe KG. [1] The ride was designed by Anton Schwarzkopf and Werner Stengel, and built by BHS. It is the largest portable roller coaster in the world, and the only one with five inversions.
A vibrating belt machine is a device that was promoted to passively reduce body fat through the use of an oscillating or vibrating belt around the exercise subject's waist, without active exercise by the user. The device was widely promoted in the 1950s and 1960s as a way to break up abdominal fat through vibration.
The heddle-bar (G) is tied to some of the warp threads (A, but not B), using loops of string called leashes (H). So when the heddle rod is pulled out and placed in the forked sticks protruding from the posts (not lettered, no technical term given in citation), the shed (1) is replaced by the counter-shed (2).
Dreier Looping, which is German for "Triple Loop", also became the first roller coaster to feature three vertical loops. It was purchased by showman Rudolf Barth, and operated on the German fair circuit for 12 years. Dreier Looping made its last fairground stop in 1996.
In 1926, Porter-Cable began to develop a niche in portable electric power tools when Chief Engineer Art Emmons invented the portable electric belt sander, called the Take-About Sander. In 1929, Emmons invented the helical drive circular saw, a compact, lightweight design that is still the most widely used circular saw design produced today.
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