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248 PROGRESS REPORT [j. s. M. P. E.
straight line optical system, power rewind, and an automatic stop to prevent film breaks.236 An inexpensive hand cranked projector has been added to the equipment in the amateur cine field.237 A selfcontained projecting unit in a walnut cabinet has been announced which uses a small translucent screen that is extended 2 feet in front of the projector.238 The Ensign Kinecam projector uses a 60 volt, 100 watt lamp with a variable resistance control.239 Bell & Howell have modified their Filmo projector to adapt it to classroom use.240
The supply and take-up reels on the new Zeiss-Ikon projector are located side by side on a common shaft under the gate and lens system. Film must be removed for rewinding.241 A 100 watt lamp, operating from either 1 10 or 220 volt circuits is incorporated in the new Agfa projector for 16 mm. film. The lamp house is fan cooled.242
A device for reproducing sound, adaptable for home movies has been described briefly. Four variable area records are printed side by side on an opaque paper positive, 6 mm. wide. The sound is reproduced by suitable electrical sound reproducers connected to a loud speaker.243 A projector using 9.5 mm. film can be equipped with a speaker unit called the "Radioscope" synchronized with the picture. 244i The unit can also be used to permit sound accompaniment of a master sound film from a central studio when a duplicate print is shown in the home.
An interesting historical description of an animated family album developed in 1902-3 was published recently in Germany.245 Five concentric rows of pictures on a disk were animated by rotating the disk and viewing the changing picture through a peep hole in a coven fitting over the box holding the disk.
Two patents have been granted on improvements in amateur projectors.246
Enlargements from 16 mm. pictures may be made up to 2J/4 by 31/ inches by using a cone like box which fits on a Filmo projector.247
A new 16 mm. reversal film has been placed on the market248 a. well as an additional negative film.249 The leader on the former i green and the trailer red on the processed film for convenience of the projectionist.
Editing, Scenarios, Libraries. — Magnetized steel letters and a stee background have been announced as titling equipment for the cine amateur.260 For use with the Ensign Auto-Kinecam, a titling box is provided wherein the camera is pointed downward at a copyboarc with movable letters fitted into the base.261