British Kinematography (1948)

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82 minimise the possibility of overlooking certain items. The mechanical side must come first because any mechanical blemish invariably interferes with the sound reproduction. Proper work sheets should be made out. Intelligent use of these quickly reveals any inherent weaknesses in the equipment, or its operation, and also shows the life cycles of the various components. A trouble analysis chart recording every fault is also helpful. Faults that caused a performance to be abandoned could be marked up in red, other faults could be marked in blue, showing at a glance those corrected on routine inspections which might have resulted in a breakdown. If the territory service is large, it can be divided up into areas and coded showing where the majority of faults occur. It will also reveal life cycles and weaknesses in the equipment and also the ability of a particular engineer. Emergency Service There must be an engineer on call at all times day or night with facilities at his disposal enabling him to tackle any emergency that may arise, including a complete 16 mm. equipment to repair a major breakdown. Generally speaking, field servicing of equipment should be avoided where the equipment is mobile, because the facilities available are poor. Contacting the unit may be delayed through various causes and the work carried out is often on makeshift lines. All regular servicing is better done at base where the right tools and a full range of spares is available. II. REQUIREMENTS AND MAINTENANCE OF PRINTS J. W. Hissey, M.B.K.S.* THE first essential requirement is a good negative, in first class physical condition and free from oil, dirt and abrasions. The positive stock, preferably fine grain, must comply with relevant B.S.I. specifications, the non-inflammable film support perfectly transparent, of adequate flexibility, and of uniform width and thickness. The emulsion must have passed through the various stages of processing to ensure that — 1. There is no danger of it separating from the base. 2. It contains sufficient moisture content to maintain its heat resisting properties. 3. It has a melting point of not less than 140° F. 4. It has been sufficiently hardened to withstand normal usage. All new prints should be subjected to a viewing and sound test prior to release. Maintenance of Prints Processed prints must be stored in damp-free conditions at the proper temperature to guard against shrinkage of the base and reduction in flexibility owing to loss of moisture content. Ideal storage conditions comprise : 1. A constant temperature of between 40° and 50" F. and a relative humidity «.f between 40% and 50%. 2. Storage racks should be away from any source of heat such as radiators, etc. 3. Prints should be stored preferably in metal or wooden cabinets or on wooden shelves and in conditions permitting free circulation of the air. Prints should k carefully examined after use or at regular intervals. *G. B. Equipments, Ltd.