connected to the system enabled the observer to measure the rate of fall of pressure dur- ing tests and thus to measure the rate of flow of air through the material. The temperature was maintained constant within 2 degrees centigi^ade throughout the tests. TEMPERATURE, HUMIDITY, AND SEASONING TESTS… … Fig. 2.—Manometer used for testing nonmetallic diaphragms balloon manometer. (See fig. 2.) This type of instrument was chosen because the construc- tion was such as to facilitate changing the diaphi^agms and because the mechanism w^as very satisfactory, exhibiting little friction and exceedingly…
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