Transactions of the Society of Motion Picture Engineers (1929)

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Beport of Standards and Nomenclature Committee ' 33 The number of teeth in contact with the film shall be the number of teeth in the arc of contact of the film with the drum, the pulling face of one tooth being at the origin of the arc. This is illustrated in Fig. 2. Fig. 2. 35 mm. Film and Equipment Light change notches on negative film. This question has been discussed at length by the committee but no definite recommendation has been formulated. It does not appear that we can agree ARROWS INPU^kTC PIRCCTION or TRAVtL EMUL5V0N SlPt UP THIS OIMCNSION IS VARlAei-C. ACCORPinG TO STEP or LIGHT CHANGE Fig. 3. to the recommendations made by the International Congress of Photography since the practice in this country is widely divergent from those recommendations. The situation as it exists at the pres