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November, 1950
159
A NEW STILL PROCESS PROJECTOR
Hugh McG. Ross, M.A.#
THIS equipment for the projection of lantern slides for process work has been developed with two aims : to obtain an unsurpassed performance, and to meet the requirements of studio personnel, particularly with regard to convenience of operation and ease of maintenance. The basic studio requirements were marshalled by the Technical Director's Department of the J. Arthur Rank Organisation, and the main features of the design evolved. These were discussed by the senior process technicians within that organisation, by the manufacturers and by the scientific consultants, Sir Robert WatsonWatt and Partners ; detailed user -requirements were then prepared. The main manufacturers, British Acoustic Films, Ltd., kindly agreed to one of their senior designers working for some weeks at the studios, to interpret these requirements and to assimilate studio conditions. It is believed that the success of this projector is largely due to this close co-operation between studio technicians and the manufacturers.
Light Source.
A Mole-Richardson MR 1250 arc lamp is used. This lamp has been described fully1 and only the main features will be mentioned. The rotating positive carbon is 16mm. diameter and the negative is 11mm., non-coppercoated. Both positive and negative jaws are water-coofed. Four currents are
Fig. I . Still Process Projector.
Formerly J. Arthur Rank Productions, Ltd.