Handbook for motion picture and stereopticon operators . of action of a scene. Thecamera in which these photographs are made con-sists of a casing or box with lens and shutter anda mechanism for rapidly shifting the sensitive sur-face in the focus of the lens. This roll of sensitivefilm is unwound past the lens, exposed, and after-ward rolled again. After development a positive or transparency isprinted therefrom, the roll subsequently beingplaced in the projecting lantern. This lantern isfitted with practically the same mechanism usedin the camera for unwinding the film, passing itbehind the
Handbook for motion picture and stereopticon operators . of action of a scene. Thecamera in which these photographs are made con-sists of a casing or box with lens and shutter anda mechanism for rapidly shifting the sensitive sur-face in the focus of the lens. This roll of sensitivefilm is unwound past the lens, exposed, and after-ward rolled again. After development a positive or transparency isprinted therefrom, the roll subsequently beingplaced in the projecting lantern. This lantern isfitted with practically the same mechanism usedin the camera for unwinding the film, passing itbehind the projecting lens and winding it again, allin such manner as to give upon the screen a singleenlarged picture of the scene photographed, andwith all the action of the original in a continuousand harmonious reproduction of singular fidelity. The entire process is attended with little diffi-culty and is exactly like ordinary photographicprocesses, although special mechanism is requiredto handle the long strips of picture-carrying rib- Operators Handbook 15. 16 Motion Picture bon. The film is of transparent celluloid, one sideof which is coated with a sensitive emulsion, thatof the negative being much more rapid than thepositive stock, although the latter produces betterresults for the lantern ribbons. The little pictures are not quite so wide as thefilm, leaving a narrow unoccupied marginal edge,in which are punched the little holes by which thefilm is kept in register during each step of the en-tire process. The pictures are f of an inch inheight by 1 inch wide, the latter dimension beingacross the film between the perforations, and areplaced one immediately above another, giving six-teen pictures to each foot of film. The standard ribbon is If inch wide and aboutToVo incn thick and in lengths approximately 200feet to each roll in America; and about 50 metersin Europe. The manufacturers furnish films,either perforated or unperforated, as desired. Theroll when received from the man
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Keywords: ., bookcentury1900, bookdecade1900, booki, booksubjectmotionpictures
