Polarized-light servo system

F. J. Maginniss (General Electric Company, Schenectady, N. Y.): The polarized-light servo system described by Mr. Berry is an important part of the General Electric differential analyzer discussed by Peterson and Kuehni. This analyzer has now been in service for about eight months. Among the considerations which led to the choice of this system to replace the mechanical torque amplifier, used in previous analyzer design, two may be mentioned. They are reduction of required maintenance and elimination of feedback between output shaft and integrating wheel. In both of these respects, the polarized-light servo system has shown up very favorably.