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  2. Simon Willard - Wikipedia

    en.wikipedia.org/wiki/Simon_Willard

    Additionally, he oversaw Harvard's management of its clocks. Willard presented two clocks to Harvard. One was a tall-case clock; the other was a wall-mounted regulator clock that was installed in a room near University Hall. A particular incident relates to Harvard's Great Orrery which was malfunctioning. Many craftsmen had unsuccessfully ...

  3. Prague astronomical clock - Wikipedia

    en.wikipedia.org/wiki/Prague_astronomical_clock

    The Orloj is mounted on the southern wall of Old Town Hall in the Old Town Square.The clock mechanism has three main components – the astronomical dial, representing the position of the Sun and Moon in the sky and displaying various astronomical details; statues of various Catholic saints stand on either side of the clock; "The Walk of the Apostles", an hourly show of moving Apostle figures ...

  4. Anchor escapement - Wikipedia

    en.wikipedia.org/wiki/Anchor_escapement

    In horology, the anchor escapement is a type of escapement used in pendulum clocks. The escapement is a mechanism in a mechanical clock that maintains the swing of the pendulum by giving it a small push each swing, and allows the clock's wheels to advance a fixed amount with each swing, moving the clock's hands forward. The anchor escapement ...

  5. Riefler escapement - Wikipedia

    en.wikipedia.org/wiki/Riefler_escapement

    It was used in the astronomical regulator clocks made by his German firm Clemens Riefler from 1890 to 1965, [3] which were perhaps the most accurate all-mechanical pendulum clocks made. An escapement is the mechanism in a mechanical clock that gives the pendulum precise impulses to keep it swinging, and allows the gear train to advance a set ...

  6. Clockwork - Wikipedia

    en.wikipedia.org/wiki/Clockwork

    Keys of various sizes for winding up mainsprings on clocks Mechanism of a Wall Clock, Ansonia Co. 1904. The stored amounts of energy used by a given piece during its operation is often housed within it; this frequently happens via a winding device that applies mechanical stress to an energy-storage mechanism such as a mainspring, thus involving some form of escapement.

  7. St Mark's Clock - Wikipedia

    en.wikipedia.org/wiki/St_Mark's_Clock

    In 1752 Bartolomeo Ferracina started work on replacing the clock, having successfully tendered for the job in public competition. He installed a new movement, removed the planetary dials, installed a rotating moon ball to show the phase, and changed the numbering of the clock face from the old Italian style (I to XXIIII in Roman numerals) to the 12-hour style, using two sets of Arabic numerals ...