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  2. Gauge block - Wikipedia

    en.wikipedia.org/wiki/Gauge_block

    Metric gauge block set, 112 pcs Another set with 8 pcs, 125 mm - 500 mm Trolley model. 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 ...

  3. Carl Edvard Johansson - Wikipedia

    en.wikipedia.org/wiki/Carl_Edvard_Johansson

    In the 1910s, the U.S. and U.K. definitions of the inch differed, with the U.S. inch being defined as 25.4000508 mm (with a reference temperature of 68 °F (20 °C)) and the U.K. inch at 25.399977 mm (with a reference temperature of 62 °F (17 °C)). When he started manufacturing gauge blocks in inch sizes in 1912, Johansson's compromise was to ...

  4. Rail transport modelling scales - Wikipedia

    en.wikipedia.org/wiki/Rail_transport_modelling...

    Ridable, outdoor gauge, named according to the gauge in inches, and scale in inches per foot, for example 7 + 1 ⁄ 4 in (184 mm) gauge, 1.5 inch scale. The gauge is 7 + 1 ⁄ 2 in (190.5 mm) in the US and Canada, where the scale sometimes is 1.6 inch for diesel-type models. Private and public (club) tracks exist in many areas.

  5. Talk:Gauge block - Wikipedia

    en.wikipedia.org/wiki/Talk:Gauge_block

    The meter, the standard unit of length in the world, is defined as the distance light travels in 1/299792458 of a second in vacuum. Precision length standards like gauge blocks are calibrated by interferometers, which count the number of wavelengths of red light from a helium neon laser that is equal to the length.

  6. List of rail transport modelling scale standards - Wikipedia

    en.wikipedia.org/wiki/List_of_rail_transport...

    A worldwide garden railroad scale. Corresponds to NEM III and NMRA 3 ⁄ 4 inch. -1:12: 4 + 3 ⁄ 4 in (121 mm) North America specific scale corresponding to NMRA 1-inch scale. 1:12 is one of the most popular backyard railway scales. -1:11: 5 in (127 mm) Used outside North America. Corresponds to NEM V. One of the most popular garden railway ...

  7. Micrometer (device) - Wikipedia

    en.wikipedia.org/wiki/Micrometer_(device)

    If the gauge block is known to be 0.75000 ± 0.00005 inch ("seven-fifty plus or minus fifty millionths", that is, "seven hundred fifty thou plus or minus half a tenth"), then the micrometer should measure it as 0.7500 inch. If the micrometer measures 0.7503 inch, then it is out of calibration.

  8. Remember These Classic Family Cars Over the Past 50 Years - AOL

    www.aol.com/50-classic-family-cars-past...

    Chrysler Newport. Years produced: 1940-1981 Original starting price: $2,964 After serving as a two-year, one-off vehicle in the '40s and '50s, the Newport settled in as an entry-level sedan and ...

  9. Inch - Wikipedia

    en.wikipedia.org/wiki/Inch

    Because Johansson's blocks were so popular, his blocks became the de facto standard for manufacturers internationally, [32] [33] with other manufacturers of gauge blocks following Johansson's definition by producing blocks designed to be equivalent to his. [34] In 1930, the British Standards Institution adopted an inch of exactly 25.4 mm.

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