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  2. Gauge block - Wikipedia

    en.wikipedia.org/wiki/Gauge_block

    Gauge blocks (also known as gage blocks, Johansson gauges, slip gauges, or Jo blocks) are a system for producing precision lengths. The individual gauge block is a metal or ceramic block that has been precision ground and lapped to a specific thickness. Gauge blocks come in sets of blocks with a range of standard lengths.

  3. Surface plate - Wikipedia

    en.wikipedia.org/wiki/Surface_plate

    There are varying grades used to describe the accuracy of some metrology equipment such as: AA, A, B, and Workshop grade. While workshop grade is the least accurate, all grades of surface plates are held to a high degree of flatness. Surface plates must be calibrated regularly to ensure that chipping, warping, or wear has not occurred.

  4. Ring gauge - Wikipedia

    en.wikipedia.org/wiki/Ring_gauge

    A ring gauge, or ring gage, is a cylindrical ring of a thermally stable material, often steel, whose inside diameter is finished to gauge tolerance and is used for checking the external diameter of a cylindrical object. [1] Ring gauges are used for comparative gauging as well as for checking, calibrating, or setting of gauges or other standards ...

  5. Gauge (instrument) - Wikipedia

    en.wikipedia.org/wiki/Gauge_(instrument)

    Gauge block, (also known as a gage block, Johansson gauge, slip gauge, or Jo block) a precision ground and lapped length measuring standard. It is used as a reference for the setting of measuring equipment used in machine shops , such as micrometers , sine bars , calipers , and dial indicators (when used in an inspection role ).

  6. Go/no-go gauge - Wikipedia

    en.wikipedia.org/wiki/Go/no-go_gauge

    Hardened and ground plug gauge Replaceable thread and plug gauges. These gauges are referred to as plug gauges; they are used in the manner of a plug.They are generally assembled from standard parts, where the gauge portion is interchangeable with other gauge pieces (obtained from a set of pin type gauge blocks) and a body that uses the collet principle to hold the gauges firmly.

  7. List of steepest gradients on adhesion railways - Wikipedia

    en.wikipedia.org/wiki/List_of_steepest_gradients...

    Saluda Grade, Saluda, North Carolina, United States The steepest standard gauge mainline railroad grade in the United States. [19] Worked by adhesion between 1878 and 2001, currently out of service. 1 in 22 (4.5%) Balsam Mountain Grade, Balsam N.C. Balsam Mountain, home of highest railroad station east of the Rockies; average grade about 4.0% ...

  8. Gage blocks - Wikipedia

    en.wikipedia.org/?title=Gage_blocks&redirect=no

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  9. Carl Edvard Johansson - Wikipedia

    en.wikipedia.org/wiki/Carl_Edvard_Johansson

    Carl Edvard Johansson (March 15, 1864 – September 30, 1943) was a Swedish inventor and scientist.. Johansson invented the gauge block set, also known as "Jo Blocks" ("Johansson gauge blocks").

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