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244 LIVING PICTUBES. 82. Harrison, G. H. and T. J. No. 17,049. i August, 1896. Motion as in Fig. 122 is applied to a wheel which drives upper and lower sprocket- wheels, between which the film is stretched. 83. Greene, W. F., and Prestwich, J. A. No. 17,224. 4 August, 1896. Motion as in Fig. 127. See also page 168. Double projection positives are printed from ordinary negatives by running through first with double spacing and then running a second time to fill the alternate spaces. Adjustment by turning the dead-wheel of the epicyclic motion b}^ hand. Duplicate form described. 84. Blair, T. H. No. 17,505. 7 August, 1896. The film is driven by two sprockets, one feed, one take-up, both continuous. Between these the film is sufficiently slack to allow an intermittent feed to be given by an arm rocked from an eccentric. Another eccentric forces pins into the perforations to steady the film during exposure. These pins have taper points which act to finally adjust the film. 85. Peschek, J., Chard, G. H., and Ackermann, H. No. 17,848. 12 August, 1896. The intermittent motion of the film is effected by a lever con- nected to a plate carrying pins, or a rubber pad which presses on the film. The lever has a side- motion which drives a wedge into another wedge- piece on the plate, thus forcing it against the film, the vertical movement of the lever drawing the film down by means of the pins or pad. A return sideway movement releases the wedge- action, and the plate is forced back free of the film by a spring, and is carried up by the lever ready for another stroke. Either a rotary or hinged shutter is employed, the latter being a frame covered with tissue paper, etc. 86. Wrench, A. No. 17,881. 12 August, 1896. Motion as in Fig. 131. See also page 165. 87. Schmidt, C. W., and Christophe, A. No. "18,884. 26 August, 1896. Instead of using flexible film,, a series of glass plates is fed to the lens from- an upper chamber and passed into a lower one.