Izod, Edwin Gilbert

Izod, Edwin Gilbert
SUBJECT AREA: Metallurgy
b. 17 July 1876 Portsmouth, England
d. 2 October 1946 England
English engineer who devised the notched-bar impact test named after him.
After a general education at Vickery's School at Southsea, Izod (who pronounced his name Izzod, not Izod) started his career as a premium apprentice at the works of Maudslay, Sons and Field at Lambeth in January 1893. When in 1995 he was engaged in the installation of machinery in HMS Renown at Pembroke, he gained some notoriety for his temerity in ordering Rear Admiral J.A.Fisher, who had no pass, out of the main engine room. He subsequently worked at Portsmouth Dockyard where the battleships Caesar and Gladiator were being engined by Maudslay's. From 1898 to 1900 Izod worked as a Demonstrator in the laboratories of University College London, and he was then engaged by Captain H. Riall Sankey as his Personal Assistant at the Rugby works of Willans and Robinson. Soon after going to Rugby, Izod was asked by Sankey to examine a failed gun barrel and try to ascertain why it burst in testing. Conventional mechanical testing did not reveal any significant differences in the properties of good and bad material. Izod found, however, that, when specimens from the burst barrel were notched, gripped in a vice, and then struck with a hammer they broke in a brittle manner, whereas sounder material merely bent plastically. From these findings his well-known notched-bar impact test emerged. His address to the British Association in September 1903 described the test and his testing machine, and was subsequently published in Engineering. Izod never claimed any priority for this method of test, and generously acknowledged his predecessors in this field, Swedenborg, Fremont, Arnold and Bent Russell. The Izod Test was rapidly adopted by the English-speaking world, although Izod himself, being a busy man, did little to publicize his work, which was introduced to the engineering world largely through the efforts of Captain Sankey. Izod became Assistant Managing Director at Willans, and in 1910 was appointed Chief Consulting Mechanical and Electrical Engineer to the Central Mining Corporation at Johannesburg. He became Managing Director of the Rand Mines in 1918, and returned to the UK in 1927 to become the Managing Director of Weymann Motor Bodies Ltd of Addlestone. As Chairman of this company he extended its activitiesconsiderably.
Principal Honours and Distinctions
MBE. Member of the Iron and Steel Institute.
Further Reading
1903, "Testing brittleness of steel", Engineering (25 September): 431–2.

Biographical history of technology. - Taylor & Francis e-Librar. . 2005.

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