The use of the North American Philips spectrometer for the radial and azimuthal scanning of the transmitted x‐ray diffraction of rayon tire yarns involved a change in the slit system from convergent to divergent, design of a rotating sample holder, a reproducible sample preparation and positioning, and calibration and control checks which guarantee that the x‐ray intensity remain constant to ±2 percent as automatically recorded by the rate meter. Typical data are presented and compared with data obtained photographically.

1.
Manufactured by North American Philips Corporation, 750 South Fulton Street, Mt. Vernon, New York.
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Segal
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Creely
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Alexander
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4.
The film was photometered with a Leeds and Northrup recording densitometer through the courtesy of the Physics Department of the North Carolina State College of Agriculture and Engineering, Raleigh, North Carolina.
5.
M.
Polanyi
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Z. Physik
7
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