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Vickers scale

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  • Vickers Shipbuilding and Engineering — Vickers Shipbuilding Engineering Limited (VSEL) Type Limited company Industry Shipbuilding Marine Engineering Fate Acquired …   Wikipedia

  • Vickers hardness test — A Vickers hardness tester The Vickers hardness test was developed in 1924 by Smith and Sandland at Vickers Ltd as an alternative to the Brinell method to measure the hardness of materials.[1] The Vickers test is often easier to use than other… …   Wikipedia

  • Vickers hardness — ▪ mineralogy       a measure of the hardness of a material, calculated from the size of an impression produced under load by a pyramid shaped diamond indenter. Devised in the 1920s by engineers at Vickers, Ltd., in the United Kingdom, the diamond …   Universalium

  • Vickers range clock — The Vickers Range Clock was a clockwork device for calculating the range to an enemy ship used by the Royal Navy from around 1906. In 1903 a device siimlar to that which became the Vickers clock was described by its inventor, Percy Scott. In… …   Wikipedia

  • Mohs scale of mineral hardness — The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. It was created in 1812 by the German geologist and mineralogist Friedrich Mohs and… …   Wikipedia

  • Canadian Vickers Varuna — Infobox Aircraft name=Varuna caption= type=Transport flying boat manufacturer=Canadian Vickers designer= first flight= introduced= retired=1932 status=out of service primary user=Royal Canadian Air Force more users= produced= number built=8 unit… …   Wikipedia

  • Rockwell scale — The Rockwell scale is a hardness scale based on the indentation hardness of a material. The Rockwell test determines the hardness by measuring the depth of penetration of an indenter under a large load compared to the penetration made by a… …   Wikipedia

  • Brinell scale — The Brinell scale characterizes the indentation hardness of materials through the scale of penetration of an indenter, loaded on a material test piece. It is one of several definitions of hardness in materials science.Proposed by Swedish engineer …   Wikipedia

  • Hardness of prominent abrasive materials — ▪ Table Hardness of prominent abrasive materials abrasive materials hardness Mohs scale (Mohs hardness) Vickers scale (Vickers hardness) Knoop scale (Knoop hardness) Natural abrasives industrial diamond 10 10,000 8,000 corundum 9 2,200 1,600… …   Universalium

  • Aeroplane Monthly — Aeroplane Aeroplane Monthly Pays  Royaume Uni Langue Anglais Périodicité Mensuel …   Wikipédia en Français

  • Indentation hardness — tests are used to determine the hardness of a material to deformation. Several such tests exist, wherein the examined material is indented until an impression is formed; these tests can be performed on a macroscopic or microscopic scale. When… …   Wikipedia

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