Abstract
The influence of some incombustible vapours upon the upward propagation
of flame through mixtures of combustible gases and vapours with air
contained in a 1$78$ in. glass tube has been examined and
some comparisons made with results in a 4 in. tube. From the data
obtained with the smaller tube it has been possible to plot diagrams
for each of the combustibles with inert vapour and air showing completely
the compositions of inflammable and non-inflammable mixtures. From
these, the limiting 'safe' composition of mixtures of inert vapour
with air and with the combustible respectively have been derived.
The combinations studied were hydrogen, methane, ethylene, carbon
monoxide, n-hexane, cyclohexane and benzene with methyl bromide;
hydrogen and n-hexane with difluorodichloromethane, and methane with
carbon tetrachloride. A sample of coal gas, the composition of which
was determined, has also been examined with methyl bromide as the
inert vapour, and it is shown that the limit curve agrees fairly
well with that calculated by Le Chatelier's rule from the curves
for its constituents.
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