British Kinematography (1948)

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M PROBLEMS OF 16mm. PROJECTION A symposium arranged by H. S. Hind, A.M. /.£.£., M.B.K.S., A.R.P.S.* and read by him to the B./C.S. Sub-standard Division on March 26, 1947. I. MAINTENANCE OF EQUIPMENT W. J. Humberstone, M.B.K.S.t THE servicing of talking picture equipment is one of the most important links in a chain. Satisfactory maintenance of road show equipment requires : — 1. An adequate stock of spare parts properly warehoused. 2. A properly equipped workshop. 3. An efficient emergency service. 4. A well trained'staff. Spare Parts The provision of spare parts is facilitated if the equipment used is of the same make, or at the most does not exceed two kinds. Spare parts can be divided into groups of consumables and non-consumables. Consumables represent lamps, valves, photo-electric cells, belts and i film cement, non-consumables being lamphouse condensers, screen surfaces, , gears, bearings, shafts, screws, capacitors, motors, governors, and transformers. Stock requirements of consumable parts are fairly easy to estimate if records are maintained, but non-consumables require care and the main► tenance of an adequate stock so stored that the part required can be obtained | in a minimum of time. Stock record cards should be kept so that stock levels can be maintained. Such cards enable an item to be properly identified, the initial amount of stock and subsequent additions are on record, the consumption is noted and a minimum stock figure is pre-set. All goods taken from stock must be covered by papers properly authorised, and worn or defective parts should be returned to stores. The Workshop A properly equipped workshop should be housed in a room with plenty of windows and large enough to accommodate at least one 16 mm. projection equipment set up to operate and project a picture of about 30 in. in width. There should be enough space to accommodate the various benches, cupboards and cabinets. The equipment is governed by the number of machines to be serviced, and test films for picture and sound must be provided. The provision of a service manual setting out the order of servicing is essential. An insulation tester (megger), an inductance and capacity analyser and at least one allpurpose meter will be required to enable a small workshop to carry out its job. Where greater workshop facilities are required, a comprehensive range of drills, taps and dies will be necessary. Undoubtedly a drilling machine, a lathe (motorised) and a grindstone, together with a greater range of meters are an advantage. It may be considered that an oscillator with a proper attenuator control box is justified. Routine Inspections Routine inspections carried out in definite order as laid down in a service manual prevent wasted effort in going over ground already covered and also ♦Sound Services, Ltd. fWestern Electric Co., Ltd.