Show uniformity Having once decided upon the and accuracy consistancy particular course to follow the audio-visu- notes regarding dicisions so that if director should al the make question arises again same the same rule can be followed The classification the and filming Dewey Decimal System 17 This system can be used for useful quite all types of is audio-visu- al aids and materials Maintenance of films and Special care should be exer- slides cised in handling films and slides The following suggestions will help avoid difficulty 1 Store films in metal containers to avoid dust and damage 2 Keep slides in slide case to prevent breakage and to insure their proper sequence 3 Handle films and A Remove dust and tetrachloride 5 slides by edge only lint with soft cloth Avoid finger marks dampened with carbon the film through a dry clean soft cloth to polish Re-r- un it scratching the emulsion on films and slides as nothing can be dona to restore it 6 Avoid 7 Prevent S Avoid extremes of l6Ibid p oil from touching films heat and humidity Film should be stored 10 McKown Harry C Instruction Hew Yorks and Roberts McGraw-H- ill Alvin B Book Company Aids Audio-Vis- ual 1949 p 14 to |