| http://www.w3.org/ns/prov#value | - The alternating beams passing through cuvettes 19 and 20 thus cause photomultiplier tube 21 to generate a time-shared output signal at its output 23, which is handled in a conventional manner to derive information, such as data based on a comparison of the optical effects of the sample material in cuvette 19 and the reference material in cuvette 20.
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