Abstract
The horizontal pendulums of the seismograph at the University of Texas have been equipped with McComb‐Romberg “pick‐ups.” Instead of recording directly, the light from the pick‐up mirror falls on a split photo cell; the current from this photo cell is amplified and sent through the recording galvanometer. The output of the amplifier is also fed to an auxiliary circuit which controls the intensity of the recording light so that its brilliance is approximately proportional to the speed with which the galvanometer spot is moving.
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