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18 MOTION PICTURE PROJECTION
Can be obtained by measuring the distance between the front and back combination then dividing by two and adding the result to the back focal length. (Written E. F.)
The equivalent focus of a plurality of lenses in combination is the focal length of a simple thin lens which will under all conditions form an image having the same magnification as will the given lens combination.
EXHAUST FAN. An air propeller used to create a vacuum.
EXTERIOR. A scene supposed to be taken out of doors.
FADE-IN. The gradual appearance of the picture from darkness to full screen brilliancy.
FADE-OUT. The gradual disappearance of the screenpicture into blackness. (The reverse of fade-in.)
FEATURE. A pictured story, a plurality of reels in length.
FIRE TRAP. An arrangement of rollers on the upper and lower magazines through which the film is fed, used to prevent the flame, in case of fire, from entering the magazines.
FIXING. Making permanent the developed image in a film.
FLAT. A bit of painted canvas, or the like.
FLASH. A short scene, usually not more than three to five feet of film.
FLASH-BACK. A very short cut-back.
FOCAL. Pertaining or belonging to a focus.
FOCUS. The point of concentration. When rays reflected from all points meet or concur.
FOOTAGE. Film length measured in feet.
FLICKER SHUTTER. A revolving shutter on head of machine just in front of the projection lens, its use being to cut off the rays of light from screen while the film is in motion in gate.
FRAME (verb). To bring a frame into register with the aperture during the period of rest.
FRAME (noun). A single picture of the series on a motion-picture film.
FRAME LINE. The dividing line between two frames.
FRAMING DEVICE. An attachment on the machine which allows the operator to frame the picture on screen
FUSE. A short length of wire of a given fusible point introduced into the electrical circuit.