Appliances used for drying gases, some being straightshaped tubes packed with small lumps of calcium chloride, which substance has a great affinity for moisture. Another variety consists of a Ushaped tube sealed at the bend with strong sulphuric acid, as it also has the property of absorbing moisture contained in gases bubbled through it, such, for example, as those which are generated by burning organic substanc es in a current of dry air or oxygen. The increase in the weight of the tube gives the weight of the water thus absorbed, from which may be calcula ted the proportion of hydrogen contained in a known weight of the organic substance employed.
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