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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.
Carl Edvard Johansson (15 March 1864 – 30 September 1943) was a Swedish inventor and scientist. Johansson invented the gauge block set, also known as "Jo Blocks" ("Johansson gauge blocks"). [ 1 ] [ 2 ] He was granted his first Swedish patent on 2 May 1901, Swedish patent No. 17017 called "Gauge Block Sets for Precision Measurement".
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 ).
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In Sweden, the gauge was nicknamed Blekinge gauge, as most of the railways in the province of Blekinge had this gauge. [14] Colonial Gauge was used in New Zealand. [15] [16] In Australia, this gauge is typically referred to as narrow gauge in comparison to 4 ft 8 + 1 ⁄ 2 in (1,435 mm) standard gauge or 5 ft 3 in (1,600 mm) broad gauge.
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Wide to gauge points are typically found on sidings situated between running lines. The type of trap points to be used depends on factors such as the gradient of the siding, and whether locomotives enter the siding. [2] Independent switches are a kind of wide to gauge switch which are part of two separate crossovers. There are three positions ...