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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
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.
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 ).
English: Photo of 36 Johansson gauge blocks wrung together and held horizontally, from a 1907 toolmaking book. The blocks are held together solely by the adhesion of their extremely flat surfaces, which is so strong that it easily supports their weight. Caption of photo: "Thirty-six gages wrung together and held horizontally".
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.
Carl Edvard Johansson was the inventor of gauge blocks. Hounshell, David A. (1984), From the American System to Mass Production, 1800–1932: The Development of Manufacturing Technology in the United States , Baltimore, Maryland: Johns Hopkins University Press , ISBN 978-0-8018-2975-8 , LCCN 83016269 , OCLC 1104810110
Production in Sweden under license commenced in 1898. (The preparatory production development at Carl Gustafs stads Gevärsfaktori found a place in history by being the event that caused Carl Edvard Johansson to invent gauge blocks.) Swedish production continued sporadically until 1918.
If gauge blocks were used to measure precise lengths, how was machines that manufacture gauge blocks set up to precise measure? Where and how do the measurement end? — Preceding unsigned comment added by 178.22.207.177 11:53, 22 February 2017 (UTC) See Meter (unit of length)#Speed of light definition. The meter, the standard unit of length in ...