Abstract

MASON and Wheeler,1 following the initial observation of Mallard and Le Chatelier, considered that when a gaseous explosive mixture is suitably ignited at the open end of a horizontal glass tube, the other end of which is closed, flame travels at a uniform speed for some distance. The results of their experi ments have been extended further by Wheeler and his collaborators to the formulation of a speed law,2 which has since been criticised by Bone, Fraser, and Winter, and interesting experimental evidence brought to disprove the so-called speed law.3 At about this time one of us (H. K. S.) was engaged in the determination of ignition temperatures,4 and came to recognise a certain approximate relation (1:2) between the ignition temperatures and flame temperatures of the mixtures generally studied for the uniform propagation law.

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