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  2. 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 ...

  3. Pallet fork - Wikipedia

    en.wikipedia.org/wiki/Pallet_fork

    Pallet fork with jewel pallets (pink) The pallet fork is above the balance wheel in this watch movement. The pallet fork is a component of the lever escapement of a mechanical watch. [1] The pallet fork and the lever form one component that sits between the escape wheel and the balance wheel. Its purpose is to lock the escape wheel, and release ...

  4. Mainspring gauge - Wikipedia

    en.wikipedia.org/wiki/Mainspring_gauge

    A better method for measuring strength is to use a slit gauge, Figure 2, with which the thickness of the mainspring is measured directly. This gauge uses a scale of sizes running from 21 (0.05 mm) to 5/0 (0.30 mm). Scales used in watchmaking generally do not use negative numbers. Instead, after size 0 there is 2/0 or 00, 3/0 or 000, and so on.

  5. Button cell - Wikipedia

    en.wikipedia.org/wiki/Button_cell

    Button, coin, or watch cells. A button cell, watch battery, or coin battery is a small battery made of a single electrochemical cell and shaped as a squat cylinder typically 5 to 25 mm (0.197 to 0.984 in) in diameter and 1 to 6 mm (0.039 to 0.236 in) high – resembling a button.

  6. Chronometry - Wikipedia

    en.wikipedia.org/wiki/Chronometry

    The largest horological membership organisation globally is the NAWCC, the National Association of Watch and Clock Collectors, which is US based, but also has local chapters elsewhere. Records of timekeeping are attested during the Paleolithic, in the form of inscriptions made to mark the passing of lunar cycles and measure years. Written ...

  7. Balance spring - Wikipedia

    en.wikipedia.org/wiki/Balance_spring

    The regulator is a moveable lever mounted on the balance cock or bridge, pivoted coaxially with the balance. A narrow slot is formed on one end of the regulator by two downward projecting pins, called curb pins, or by a curb pin and a pin with a heavier section called a boot.

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    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. Jewel bearing - Wikipedia

    en.wikipedia.org/wiki/Jewel_bearing

    Ruby jewel bearings used for a balance wheel in a mechanical watch movement Cross-section of a jewel bearing in a mechanical watch. This type of donut-shaped bearing (red) is called a hole jewel, used for most of the ordinary wheels in the gear train. It is usually made of synthetic sapphire or ruby, press-fit into a hole in the movement's ...

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