Johanssonn.
/jəʊˈhansən/ Used attributively to designate a type of steel block originated by Johansson which is made with flat, parallel faces and of a designated length to a high degree of accuracy, and forms one of a set of different sizes used in making up standard lengths.
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the world > relative properties > measurement > [noun] > that by which one measures > an authorized measuring standard
assizea1400
standard1424
gaugec1450
stint1485
stand1550
standing measure1556
Johansson1918
1918 D. T. Hamilton Gages i. 3 (heading) Johansson reference blocks.
1920 Inst. Mech. Engineers: Proc. Nov. 1102 A gauge of known length is made up by wringing together a series of Johansson gauges.
1932 A. C. Hardy & F. H. Perrin Princ. Optics xxviii. 577 A set of Johansson gauges used in conjunction with a plane test glass..can be used for the extremely accurate measurement of thickness.
1935 O. W. Boston Engin. Shop Pract. II. ix. 448 So-called master gage blocks with very hard, smooth, flat, and parallel surfaces in the form of Johansson gages..which are known as Swedish gages as they were made in Sweden, but which are now owned and made by the Ford Motor Company.
1941 A. W. Judge Aircraft Engines II. iv. 141 The inside walls..receive a micro-finish..guaranteed to be accurate within 2 micro-inches..longitudinally; this corresponds to the surface finish of Johannson gauge blocks.
1943 S. H. Lebowitz Pre-Service Course Machine Sci. vi. 149 When two adjoining surfaces of solids are sufficiently smooth and plane, they cohere from relatively slight pressure. This fact can be demonstrated with Johansson gage blocks.
1968 J. A. Rankin Workshop Processes & Materials II. ix. 156 Slip gauges, often called Johannsen gauges after their originator, are rectangular blocks of steel with a cross-section of about 11/ 4 in. by 3/ 8 in. which are hardened before being finished to size.
This entry has not yet been fully updated (first published 1976; most recently modified version published online December 2020).
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n.1918