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  2. Prayer wheel - Wikipedia

    en.wikipedia.org/wiki/Prayer_wheel

    A prayer wheel, or mani wheel, is a cylindrical wheel ( Tibetan: འཁོར་ལོ།, Wylie: 'khor lo, Oirat: кюрдэ) for Buddhist recitation. The wheel is installed on a spindle made from metal, wood, stone, leather, or coarse cotton. Prayer wheels are common in Tibet and areas where Tibetan culture is predominant. Traditionally, a ...

  3. Freewheel - Wikipedia

    en.wikipedia.org/wiki/Freewheel

    In mechanical or automotive engineering, a freewheel or overrunning clutch is a device in a transmission that disengages the driveshaft from the driven shaft when the driven shaft rotates faster than the driveshaft. An overdrive is sometimes mistakenly called a freewheel, but is otherwise unrelated. The condition of a driven shaft spinning ...

  4. Phenakistiscope - Wikipedia

    en.wikipedia.org/wiki/Phenakistiscope

    A family viewing animations in a mirror through the slits of stroboscopic discs (detail of an illustration by E. Schule on the box label for Magic Disk - Disques Magiques, c. 1833) The phenakistiscope (also known by the spellings phénakisticope or phenakistoscope) was the first widespread animation device that created a fluid illusion of motion.

  5. Hamster wheel - Wikipedia

    en.wikipedia.org/wiki/Hamster_wheel

    A hamster wheel or running wheel is an exercise device used primarily by hamsters and other rodents, but also by other cursorial animals when given the opportunity. Most of these devices consist of a runged or ridged wheel held on a stand by a single or pair of stub axles. Hamster wheels allow rodents to run even when their space is confined.

  6. Newton disc - Wikipedia

    en.wikipedia.org/wiki/Newton_disc

    Newton disc. The Newton disc, also known as the disappearing colour disc, is a well-known physics experiment with a rotating disc with segments in different colours (usually Newton's primary colours: red, orange, yellow, green, blue, indigo, and violet, commonly known by the abbreviation ROYGBIV) appearing as white (or off-white or grey) when ...

  7. List of Doctor Who supporting characters - Wikipedia

    en.wikipedia.org/wiki/List_of_Doctor_Who...

    This list includes characters who appear to be human and who are not known to be anything other than human, even if having originated extra-terrestrially. Ashildr AKA Lady Me ( Maisie Williams) [ 1] Captain Henry Avery ( Hugh Bonneville) [ 2] Toby Avery ( Oscar Lloyd) [ 3] Sophie Benson ( Daisy Haggard) [ 4]

  8. History of perpetual motion machines - Wikipedia

    en.wikipedia.org/wiki/History_of_perpetual...

    The history of perpetual motion machines dates at least back to the Middle Ages. For millennia, it was not clear whether perpetual motion devices were possible or not, but modern theories of thermodynamics have shown that they are impossible. Despite this, many attempts have been made to construct such machines, continuing into modern times.

  9. Spinning wheel - Wikipedia

    en.wikipedia.org/wiki/Spinning_wheel

    The spinning drive wheel turns the flyer and, via friction with the flyer shaft, the bobbin. A short tension band, or brake band, adds drag to the bobbin such that when the spinner loosens their tension on the newly spun yarn, the bobbin and flyer spin relative to each other and the yarn is wound onto the bobbin.

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