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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.
Paragraph 3 of the history section gives the incorporation date of AB C.E. Johansson as March 16, 1917. I've seen this date in the Ford history and maybe elsewhere but Althin; CEJ The Master of Measurement gives this date as March 16, 1911. Ref: Althin p. 126 and in the chronology on p. 163 (only 1911 without month and day here).
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).
The Starrett corporation has continuously expanded through its history through the patenting of products and takeovers of other manufacturers. In 1878 Laroy S. Starrett invented and patented the first combination square, [4] and in 1880 he founded the L.S. Starrett Company in Athol, Massachusetts, in order to produce it and other precision ...
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Historical geographic information systems are built from a variety of sources and techniques. An especially prominent method is the digitization and georeferencing of historical maps. Old maps may contain valuable information about the past. By adding coordinates to such maps, they may be added as a feature layer to modern GIS data.