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  2. Weight plate - Wikipedia

    en.wikipedia.org/wiki/Weight_plate

    Two general categories exist: "standard" plates, which have a center hole of approximately 25 mm (one inch), and "Olympic" plates, meant to fit on the 50 mm (two inches) sleeves of Olympic barbells. [ 2 ] [ 3 ] Standard plates are usually paired with adjustable dumbbells and Olympic plates with full-size barbells, although standard barbells and ...

  3. BUR Barbell Company - Wikipedia

    en.wikipedia.org/wiki/BUR_Barbell_Company

    BUR did not manufacture Olympic bars or Olympic-sized plates. The original BUR-BEL plates had a center hole diameter of 1-1/4" and were designed to fit a 1-1/16" bar. Sometime in the 1950s, the bar diameter was reduced to 1" and the plates were drilled with a 1-1/16" hole. During its 38 years of operation, BUR Barbell offered the following ...

  4. Barbell - Wikipedia

    en.wikipedia.org/wiki/Barbell

    Adjustable dumbbells are the most prominent use of "standard" weight plates (those having a 27 millimetres (1.1 in) to 31 millimetres (1.2 in) center hole). Some dumbbell sets come with an attaching bar to convert the pair to a single barbell.

  5. Unusual types of gramophone records - Wikipedia

    en.wikipedia.org/wiki/Unusual_types_of...

    United had a 1 + 1 ⁄ 2-inch hole. [20]: 210 2 in (51 mm) Seeburg 1000 records have a 2-inch center hole. [21] 3 in (76 mm) Aretino had a three-inch hole. [20]: 9 The 3-inch spindle format would be resurrected some 40 years later for the Holy Bible Old and New Testaments produced at 16 RPM by the Audio Book Company of St. Joseph, Michigan. The ...

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  7. Weight machine - Wikipedia

    en.wikipedia.org/wiki/Weight_machine

    The lever will provide a leverage advantage of 2:1, and the incline will have an advantage of 1:√2/2, for a net mechanical advantage of (4/√2):1 ≈ 2.8:1. Thus 50 kg (~491 N) of plates will apply to the user only an equaling weight of 18 kg or a force of ~174 N at the beginning of the motion.

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