Infrared Emissivities and Absorptivities of Gases *
نویسندگان
چکیده
Abrading decreases the strength of glass at these low temperatures in the same wayas at higher temperatures. Lowering the test temperature increases the strength, up to a point, of both abraded and unabraded specimens. The breaking stress at 194°K and 296 K is dependent on the rate of loading but appears to be independent of the rate at 20 0 K and 76°K. Contact with liquid nitrogen and hydrogen does not appear to affect adversely the breaking stress. The fatigue or endurance limit at 76°K appears to be greater than 9000 psi. However, since some of the specimens withstood loads of 10 000 psi for several
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