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  2. Pinwheel calculator - Wikipedia

    en.wikipedia.org/wiki/Pinwheel_calculator

    He also designed a machine using Leibniz wheels in 1777. [6] Dr. Didier Roth, a French inventor, patented and built a machine based on that design in 1842. Izrael Staffel, a polish clockmaker introduced his pinwheel machine in 1845 at an industrial exposition in Warsaw, Poland and won a gold medal in 1851 at The Great Exhibition in London.

  3. Pinsetter - Wikipedia

    en.wikipedia.org/wiki/Pinsetter

    A 5-pin bowling pinsetter in use at a bowling alley in Toronto Pinsetters in operation at a bowling alley as seen from behind the lanes. In bowling, a pinsetter or pinspotter is an automated mechanical device that sets bowling pins back in their original positions, returns bowling balls to the front of the alley, and clears fallen pins on the pin deck.

  4. Tubular pin tumbler lock - Wikipedia

    en.wikipedia.org/wiki/Tubular_pin_tumbler_lock

    A tubular lock and key. A tubular pin tumbler lock, also known as a circle pin tumbler lock, radial lock, or the trademark Ace lock popularized by manufacturer Chicago Lock Company since 1933, is a variety of pin tumbler lock in which a number of pins are arranged in a circular pattern, and the corresponding key is tubular or cylindrical in shape.

  5. Die head - Wikipedia

    en.wikipedia.org/wiki/Die_head

    The lower picture at the right shows four sets of chasers. Each set of chasers is designed to cut a different thread. One set of chasers would be used at a time, each chaser is inserted into the die head (in the correct order) and the die head is closed bringing the chasers down to their cutting position.

  6. Pin-pallet escapement - Wikipedia

    en.wikipedia.org/wiki/Pin-pallet_escapement

    A Roskopf, pin-lever, or pin-pallet escapement is an inexpensive, less accurate version of the lever escapement, used in mechanical alarm clocks, kitchen timers, mantel clocks and, until the 1970s, cheap watches now known as pin lever watches. It was popularized by German watchmaker Georges Frederic Roskopf in its "proletarian watch" from 1867 ...

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  8. Machine Design - Wikipedia

    en.wikipedia.org/wiki/Machine_Design

    The inaugural issue of Machine Design coincided almost exactly with the 1929 stock-market crash and the beginning of the Great Depression.Although the nation was in the economic doldrums, there was significant design development taking place in almost all industrial segments including automotive, aircraft, farm equipment, home appliances, and industrial machinery.

  9. How are pin placements decided for U.S. Open? It's science ...

    www.aol.com/news/pin-placements-decided-u-open...

    Jason Day hits out of a green-side bunker on the 8th hole during the first round of the U.S. Open at Los Angeles Country Club. Pin placement green approaches.