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ART. 219 - On the Amount of Argon and Helium contained in the Gas from the Bath Springs

Published online by Cambridge University Press:  05 July 2011

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Summary

The presence of helium in the residue after removal of nitrogen from this gas was proved in a former paper, but there was some doubt as to the relative proportions of argon and helium. A fresh sample, kindly collected by Dr Richardson, has therefore been examined. Of this 2,500 c.c., submitted to electric sparks in presence of oxygen, gave a final residue of 37 c.c., after removal of all gases known until recently. The spectrum of the residue, observed at atmospheric pressure, showed argon, and the D3 line of helium very plainly.

The easy visibility of D3 suggested the presence of helium in some such proportion as 10 per cent., and this conjecture has been confirmed by a determination of the refractivity of the mixture. It may be remembered that while the refractivity of argon approaches closely that of air, the relative number being 0·961, the refractivity of helium (as supplied to me by Professor Ramsay) is very low, being only 0·146 on the same scale. If we assume that any sample of gas is a mixture of these two, its refractivity will determine the proportions in which the components are present.

The observations were made by an apparatus similar in character to that already described, but designed to work with smaller quantities of gas.

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Publisher: Cambridge University Press
Print publication year: 2009
First published in: 1903

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