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The Hopkinson pressure bar was first suggested by Bertram Hopkinson in 1914 [1] as a way to measure stress pulse propagation in a metal bar. Later, in 1949 Herbert Kolsky [2] refined Hopkinson's technique by using two Hopkinson bars in series, now known as the split-Hopkinson bar, to measure stress and strain, incorporating advancements in the cathode ray oscilloscope in conjunction with ...
Weir boiler feedwater pump. The company was established in 1871 as an engineering firm by two brothers, George and James Weir, founding G. & J. Weir Ltd. [3] The Weir brothers produced numerous groundbreaking inventions in pumping equipment, primarily for the Clyde shipyards and the steam ships built there.
A DIN standard for gas cylinder valves for test pressures up to 300 bar (4,400 psi). EN 15202 [9] A European standard for LPG equipment and accessories, specifying LPG cylinder valve connections. [10] EN 417: European norm specification concerning non-refillable metallic cartridges for liquefied petroleum gases.
John Hopkinson, FRS, (27 July 1849 – 27 August 1898) was a British physicist, electrical engineer, Fellow of the Royal Society and President of the IEE (now the IET) twice in 1890 and 1896. He invented the three-wire ( three-phase ) system for the distribution of electrical power, for which he was granted a patent in 1882.
Hopkinson married Minnie Campbell (1862-1936) of County Antrim, and they had two children, Edward Campbell (1889-1966) and Katharine Campbell (1897-1986). [4] His elder brothers included the noted physicist and engineer John Hopkinson , and Sir Alfred Hopkinson , vice-chancellor of the University of Manchester , and amongst his nephews were ...
The following is a list of notable deaths in April 2004.. Entries for each day are listed alphabetically by surname. A typical entry lists information in the following sequence:
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