The author describes a quick method for determining porosity in oil and gas sands by means of a reasonably cheap apparatus than can easily be carried in fieldwork. The novel feature of the method described lies not so much in the mechanism as in the use of acetylene tetrachloride, which possesses the advantageous features of readily entering the pore space of all types of sand without causing disintegration and without rapid evaporation. An idea of the accuracy of this method is given by an analysis of each possible source of error, both in method and apparatus, and the conclusion is reached that the acetylene tetrachloride method affords a reasonably accurate means for the determination of porosity, especially useful for rapid work.

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