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— 35i —
constructed electric resistance-stove is prescribed in which at a temperature ot 3500 the film must not ignite within ten minutes.
For the more important purpose of determining combustibility the following are the provisions at present in force: a piece of film 35 cm. long is first cleared of emulsion by washing in hot water and after drying, is hung upon wire drawn through the perforations at intervals of not more than 10 mm.; the wire must not be thicker than 0,5 mm. At a point 5 cm. from the end at which the film is ignited, a postage stamp is affixed. A light is then put to this end of the film and the time is measured which it takes the film to burn from the moment the flame reaches the stamp until it is completely extinguished. Film is deemed comparatively incombustible, if after being lit, the flame goes out of itself or if a piece of film 30 cm. long requires more than a minute to burn completely out.
Accordingly, the advantages of safety-film are so great that school cinemas should in future use none other, while the advantages of substandard film — lower cost, easier manipulation, cheaper projection, sufficient transparency — are also so important that schools will probably decide before long in favour of the 16 mm. safety-film.
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