. Transactions of the Society of Motion Picture Engineers (1921). s devised; namely, a small ball and a split clamp. The membercarrying the mirror is threaded through the ball so that the mirrorcan be drawn back and forth and, in fact, every conceivable settingcan be made and the ball clamped with one setting. Such a universal 177 adjustment is of the utmost importance in forming the filament coilimages of the exact size of the projected filament coils. Figure 2and Figure 13. In designing a satisfactory projection device, we have been verycareful to make sure that the light we have gained by t
. Transactions of the Society of Motion Picture Engineers (1921). s devised; namely, a small ball and a split clamp. The membercarrying the mirror is threaded through the ball so that the mirrorcan be drawn back and forth and, in fact, every conceivable settingcan be made and the ball clamped with one setting. Such a universal 177 adjustment is of the utmost importance in forming the filament coilimages of the exact size of the projected filament coils. Figure 2and Figure 13. In designing a satisfactory projection device, we have been verycareful to make sure that the light we have gained by these rathercostly methods shall be conserved and in lantern slide projection weadvocate the use of an additional plano-convex condenser this means we are always sure that the condenser used for motionpicture projection will be free from the lantern slide holder. Alantern slide holder absorbs 30% of the light. However, in thedevice shown in Figure 11, where both prismatic and piano con-denser systems are provided, a track juts out from the base casting. Fig. 13. Effect of Spherical Mirror on Screen Illumination. on which the housing is slidibly mounted in such a manner that thecorrect distance is provided when the plano-convex system is usedfor the projection of lantern slides and when the prismatic condenseris used for the projection of motion pictures the housing can be runback to the 6}^ setting between aperture and condenser face. Bythis means we make sure that the full value of the lamp is utilizedw^hen used for motion picture projection. In the case of arc lamp installations, instruments such asammeters, etc., have either been absolutely lacking or placed on aswitchboard over on the wall away from the machine and in manycases never looked at by the projectionist, as a few amperes one wayor the other made but little difference in the operation of the the other hand, with the Mazda Motion Picture Projector Lamp, 178 a few amperes rise may mean the sudden bur
Size: 1843px × 1355px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorsocietyo, bookcentury1900, bookdecade1920, bookyear1921
