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  2. Useless machine - Wikipedia

    en.wikipedia.org/wiki/Useless_machine

    Useless machine. A useless machine or useless box is a device whose only function is to turn itself off. The best-known useless machines are those inspired by Marvin Minsky 's design, in which the device's sole function is to switch itself off by operating its own "off" switch. Such machines were popularized commercially in the 1960s, sold as ...

  3. Automat - Wikipedia

    en.wikipedia.org/wiki/Automat

    Automat. The first automat, at 13 Leipziger Straße, Berlin, Germany; 1897 (Max Sielaff [1] [2]) A food ticket machine in Japan, 2022. An automat is a type of fast-food restaurant where food and drink are served through a vending machine, typically without waitstaff. The world's first automat, Quisisana, opened in Berlin, Germany in 1895.

  4. Simple machine - Wikipedia

    en.wikipedia.org/wiki/Simple_machine

    Simple machine. The six classical simple machines. A simple machine is a mechanical device that changes the direction or magnitude of a force. [1] In general, they can be defined as the simplest mechanisms that use mechanical advantage (also called leverage) to multiply force. [2] Usually the term refers to the six classical simple machines ...

  5. Point machine - Wikipedia

    en.wikipedia.org/wiki/Point_machine

    A point machine conversion system consists of a remotely controlled device attached to an existing manually operated point that allows the shunter/driver to remotely operate hand points with a radio handset. Each converter can be used as a stand-alone or multiple units can be installed operating together with routing.

  6. Mealy machine - Wikipedia

    en.wikipedia.org/wiki/Mealy_machine

    Mealy machine. In the theory of computation, a Mealy machine is a finite-state machine whose output values are determined both by its current state and the current inputs. This is in contrast to a Moore machine, whose output values are determined solely by its current state. A Mealy machine is a deterministic finite-state transducer: for each ...

  7. Perpetual motion - Wikipedia

    en.wikipedia.org/wiki/Perpetual_motion

    Perpetual motion is the motion of bodies that continues forever in an unperturbed system. A perpetual motion machine is a hypothetical machine that can do work infinitely without an external energy source. This kind of machine is impossible, since its existence would violate the first and/or second laws of thermodynamics.

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