Journal of the Society of Motion Picture Engineers (1930-1949)

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632 ARTHUR J. HOLMAN [J. S. M. P. E. our final lens wheel assembly approaches to this ideal condition, the steadier will be our projected picture, the better will be the definition, and the more apparent will be the peculiarly pleasing screen qualities produced by this system of projection. The instrument for accomplishing the exact positioning of the optical centers of lens sectors operates on the double error principle. FIG. 6. Lens setter, front view showing lens wheel below axis of telescope tube. In Fig. 4 is shown a right side view, in Fig. 5 a left front view of this instrument. Fig. 6 and Fig. 7 are head-on views showing the lens wheel in different positions, the displacement being due to rotation of the telescope tube. The lens setter consists essentially of a rotatable telescope tube having an offset bracket whereon the lens wheel is mounted in a manner whereby a lens sector may be rotated about the axis of the telescope tube, a pair of cross hairs intersecting on the axis of the telescope tube, an eye piece adjusted to permit observation