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Feb., 1930] PROGRESS REPORT 227
duction is in progress. Patent difficulties have held up construction plans generally in Europe but these are reported to have been cleared up recently. Descriptions of several sound studios have been published.20
In filming Trader Horn in the Belgian Congo, complete sound recording equipment and laboratory processing apparatus were used so that each day's negatives could be processed and inspected before changing to a new location.203
Lenses and Shutters. — Lee21 has reviewed the functions of modern high aperture lenses and predicts that progress may be looked for in improved color correction for use with panchromatic films. A new lens of //1. 5 aperture has been described adaptable to most modern professional and amateur cine cameras.22 This aperture is claimed by Sonnefeld23 to represent very nearly the limit of wide aperture lens design. A novel lens for multi-image photography contains several reflecting prisms between the front and back components.24 Gifford25 has given details for constructing rapid rectilinear lenses of fluorite and quartz and of calcite and quartz for ultra-violet photography. . . A lens for use in a non-intermittent motion picture camera has been patented.26
Patents on shutters for cine cameras are related to shutters adaptable for either cameras or projectors, regulators for controlling rotational speed of the shutter with changes in cranking speed, shutter blades designed as spherical sections, etc.27
Cameras and Accessories. — Descriptions of new cameras or reconstructed cameras are somewhat meager although several of these are known to be in daily use in connection with sound recording, natural color photography, and the four types of wide pictures mentioned previously in this report. Useful data by Reinecke28 on the theory of movement in relation to cine apparatus should prove of assistance to designers of cameras and other equipment. Effective illumination in making good lap dissolves has been discussed by Kofinger.29 Brackets attached to the tripod top have been described for holding the camera view finder away from the camera and allowing the director to view the action conveniently.30 At the last meeting of the Society, Struss31 described the method of arranging a battery of several cameras for simultaneous photography of action in dialog pictures. Six cameras were used in one scene in photographing Coquette, and about 1000 feet of film were used in each camera. It was possible to complete the scene "shooting" in two days originally scheduled for five days.