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* Vickers Hardness, a hardness test.
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Vickers and Hardness
Vickers Container and Packaging Machinery Division, including the Vickers Stitcher and Vickers Hardness Machine business, was bought by Fords Industrial Products, part of Barry Wehmiller in 1986.
In 1991 the Vickers Hardness Machinery business was bought by the then field engineers, and continues today as UK Calibrations Limited based in Kidderminster.
The unit of hardness given by the test is known as the Vickers Pyramid Number ( HV ) or Diamond Pyramid Hardness ( DPH ).
Vickers and hardness
Though bronze is generally harder than wrought iron, with Vickers hardness of 60 – 258 vs. 30 – 80, the Bronze Age gave way to the Iron Age ; this happened because iron was easier to find and easier to process.
* Hardnesses of the elements ( data page ) — Mohs hardness, Vickers hardness, Brinell hardness
* Vickers hardness test
# Vickers hardness test – using a pyramidal diamond indenter ; and
Vickers and Rockwell hardness numbers exhibit qualitatively different behaviour when used to describe some materials and phenomena.
A superhard material is a material with a hardness value exceeding 40 GPa ( gigapascals ) when measured by the Vickers hardness test.
Diamond is the hardest known material to date with a Vickers hardness in the range of 70 – 150 GPa.
An indentation left in case-hardened steel after a Vickers hardness test.
Measuring the mechanical hardness of materials changed to using a nanoindenter ( usually made of diamond ) and evaluating bulk moduli, and the Brinell, Rockwell, Knoop and Vickers scales have been developed.
A Vickers hardness tester
The Vickers hardness test was developed in 1921 by Robert L. Smith and George E. Sandland at Vickers Ltd as an alternative to the Brinell method to measure the hardness of materials.
The Vickers test is often easier to use than other hardness tests since the required calculations are independent of the size of the indenter, and the indenter can be used for all materials irrespective of hardness.
The Vickers test can be used for all metals and has one of the widest scales among hardness tests.
The pyramidal diamond indenter of a Vickers hardness tester.
An indentation left in case-hardened steel after a Vickers hardness test.
To calculate Vickers hardness number using SI units one needs to convert the force applied from kilogram-force to newtons by multiplying by 9. 806 65 ( standard gravity ) and convert mm to m. To do the calculation directly, the following equation can be used:
Vickers and test
This airfield opened as a flight test centre for Vickers in 1944 and used until 1972 ( latterly by the BAC ).
Built towards the end of World War 2 as a flight test airfield for the Vickers aircraft factory at nearby Brooklands, it opened in 1944 and after extended use for the development of military aircraft during the Cold War, it finally closed in 1972.
On 16 May 1922, Metropolitan Vickers Company, Ltd. (" Metrovick "), in Manchester commenced test broadcasting from its own station identified as 2ZY.
" Jock " Bryce-former chief test pilot of BAC, also chief test pilot of Vickers Armstrong has lived in Weybridge since the early 1960s
* On 19 January 1973, Vickers Viscount G-AOHI crashed into Ben More, Perthshire while on a test flight.
As late as 1972, this airfield was in service as a satellite fit-out and flight test centre for Vickers and latterly the British Aircraft Corporation, linked to their main factory and airfield at nearby Brooklands, Weybridge, capable of taking aircraft as large as the VC10.
The loss of a Vickers Wellington equipped with Gee over Germany on August 13 raises fears that the Germans have captured Gee and will counter it, and no further test flights occur over Germany.
* July 13 – The Imperial Airways Vickers Vulcan G-EBLB crashes nearly Purley, Surrey, in the United Kingdom, during a test flight, killing four of the six people on board.
In 2002, when Page set up a scanning device at Google to test how fast books could be scanned, the first book he scanned was Vickers ' The Google Book.
Vickers test scheme
Whereas the Vickers scale is widely accepted as a most common test, there remain controversies on the weight load to be applied during the test.
On 19 January 1973, a Vickers Viscount of British European Airways took off from Glasgow International Airport at about 2: 20pm on a test flight to be conducted at Flight Level ( FL ) 40 ; in the conditions prevailing at the time FL40 was equivalent to about.
Vickers test scheme
Vickers and .
The first fully armored one was the " Motor War Car " designed by Vickers in England in 1902.
Vickers Armstrong also developed a SPAGG based on the chassis of the Mk. E 6-ton light tank / Dragon Medium Mark IV tractor, mounting a Vickers QF-1 " Pom-Pom " gun of 40 mm.
About 26 were sold to Siam and saw action as Infantry support guns and AA guns during the Franco-Thai war ( 1940-1941 ) along with 30 Vickers Mk. E Type B 6-ton tanks.
* T-55 MARRS-Fitted with a Vickers armoured recovery vehicle kit.
* No. 1312 Flight1 Vickers VC10, 1 Hercules C3
Vickers F. B. 5 Gunbus
Some of the first such " fighters " belonged to the " gunbus " series of experimental gun carriers of the British Vickers company that culminated in the Vickers F. B. 5 Gunbus of 1914.
They were armed with one or two Maxim or Vickers machine guns, which were easier to synchronize than other types, firing through the propeller arc.
* Vickers, Brian, ed.
| guns = 1 × forward firing. 303 in ( 7. 7 mm ) Vickers gun and 1 ×. 303 in ( 7. 7 mm ) Lewis gun on Scarff ring in rear cockpit.
0.211 seconds.