Abstract
Abstract Apparatus and procedure are described for investigating the influence of temperature, pressure, and humidity upon the capacity of rubber membranes to retain air under pressure. The relation between total pressure and permeability has been found to be almost linear, the permeability being approximately proportional to pressure. The temperature coefficient of permeability is very high, thus indicating that the pressures of inner tubes should be checked much more frequently in summer than in winter. Moisture has been found to decrease the permeability of rubber to air slightly under certain circumstances. Prolonged immersion of the rubber in water, however, resulted in an appreciable increase in permeability.
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