Abstract
A direct current circuit, efficient over a wide range of light levels, has been developed for the comparison of spectral line intensities. The potentials built up across a pair of condensers due to the accumulated charges from two photomultiplier tubes exposed to the lines are applied independently to the grids of the valves in a symmetrical two-stage cathode follower circuit. A null setting on an accurately wound potentiometer, as indicated by a short period galvanometer, both associated with the low impedance output points of the cathode-followers, gives directly the ratio of these potentials and hence the line intensity ratios. The circuit is virtually independent of supply potential variations and is free from drift. Complete compensation for phototube dark currents is provided.
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