A light-seeking control system, used to track the sun, is shown in Figure P1.5. The output shaft, driven by the motor through a worm reduction gear, has a bracket attached on which are mounted two photocells. Complete the closed-loop system so that the system follows the light source.

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Motor Lighi Photocell Tubes Gers FIGURE P1.5 A photocell is mounted in each tube. The light reaching each cell is the same in both only when the light source is axactly in the middle as shown.