A photoelectric densitometer is described which makes use of the remote cut‐off characteristic of a 58 type thermionic tube to give a meter reading which is very nearly proportional to density. Commercial alternating current is utilized throughout, resulting in a convenient and portable type of instrument. A method is described by which it can also be used to measure the blackness of opaque objects.
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© 1935 American Institute of Physics.
1935
American Institute of Physics
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