A.W. Helz
1973
<p>A microphotometer is described for making magnetic tape recordings of spectra 480 mm long from 102- by 508-mm photographic plates. Transmission readings are recorded at a rate exceeding 1,300 per second for every 5.08 um of length of the spectrum, A two-line<br />cadmium fiducial line system and a developing tank for 102- by 508-mm plates also are described as equipment ancillary to a system of<br />computer spectral analysis applied to the spectrochemical analysis of geologic materials.</p>
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U.S. Geological Survey
Spectrochemical computer analysis - instrumentation
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