Chemical weapons and the United Kingdom army against British and Canadian soldiers near Ypres, Belgium, in 1917 and later also against the French Second Army. The name Yprite comes from its usage by the German army near the town of Ypres. The Allies did not use mustard gas until November 1917 at Cambrai, France, after the armies had captured a stockpile of German mustard-gas shells. It took the British more than a year to develop their own mustard gas weapon, with production of the chemicals centred on Avonmouth Docks. (The only option available to the British was the Despretz–Niemann–Guthrie process). This was used first in September
Gas Mark Gas Mark The Gas Mark is a temperature scale used on gas ovens and cookers in Great Britain, Ireland and some Commonwealth of Nations countries. The draft 2003 edition of the "Oxford English Dictionary" lists the earliest known usage of the concept as being in L. Chatterton's book "Modern Cookery" published in 1943: "Afternoon tea scones… Time: 20 minutes. Temperature: Gas, Regulo Mark 7". "Regulo" was a type of gas regulator used by a manufacturer of cookers; however, the scale has now become universal, and the word "Regulo" is rarely used. The term "gas mark" was a subject of the