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  2. Barn door tracker - Wikipedia

    en.wikipedia.org/wiki/Barn_door_tracker

    A barn door tracker, also known as a Haig or Scotch mount, is a device used to cancel out the diurnal motion of the Earth for the observation or photography of astronomical objects. It is a simple alternative to attaching a camera to a motorized equatorial mount .

  3. Lock bypass - Wikipedia

    en.wikipedia.org/wiki/Lock_bypass

    A lock bypass is a technique in lockpicking, of defeating a lock through unlatching the underlying locking mechanism without operating the lock at all. It is commonly used on devices such as combination locks , where there is no natural access (such as a keyhole) for a tool to reach the locking mechanism.

  4. Ladder paradox - Wikipedia

    en.wikipedia.org/wiki/Ladder_paradox

    The door closes, and then opens again to let the front of the ladder pass through. At a later time, the back of the ladder passes through the entrance door, which closes and then opens. We see that, as simultaneity is relative, the two doors did not need to be shut at the same time, and the ladder did not need to fit inside the garage.

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  7. Wikipedia:Vital articles/List of all articles - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Vital_articles/...

    (2,879) T Tauri star · T cell · T-Series (company) · T-shirt · T-square · T-top · T. Allston Brown · T. Berry Brazelton · T. Boone Pickens · T. E. Hulme · T. E. Lawrence · T. H. Green · T. H. White · T. Nelson Downs · T. S. Eliot · T.A.T.u. · TGV · TIFF · TLC (group) · TNT · TNT equivalent · TRAPPIST-1 · TRS-80 · TSMC · TU Dresden · TV Guide · TVXQ · TW Hydrae · Ta ...

  8. Rolling code - Wikipedia

    en.wikipedia.org/wiki/Rolling_code

    A rolling code (or sometimes called a hopping code) is used in keyless entry systems to prevent a simple form of replay attack, where an eavesdropper records the transmission and replays it at a later time to cause the receiver to 'unlock'. Such systems are typical in garage door openers and keyless car entry systems.

  9. Selective door operation - Wikipedia

    en.wikipedia.org/wiki/Selective_door_operation

    Selective door operation is implemented at certain railway stations in the United States. In the New York City Subway, the 6 + 1 ⁄ 2-car-long platforms at 145th Street (and formerly the 5-car-long loop platforms at South Ferry) are too short to accommodate full-length trains of ten 51.4-foot-long (15.7 m) cars, so only the first five cars of the train opened their doors at these stations.