Richardson's handbook of projection (1927)

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MANAGERS AND PROJECTIONISTS 801 Another change on the Power's Improved lamp from the G. E. type lamp is the new location of the detent spring, which is now placed on the right hand, or working side of the lamp, so as to make the detent adjusting screw, more accessible to the projectionist when he desires to adjust the rate of the positive carbon feed. The instructions pages 794 to 797 for the care, operation Figure 305