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56 Transactions of S.M.P.E., Vol. XIII, No. 37, 1929
of too gi'eat footage to be placed on a single thousand foot reel. In practice a term applied to photoplays requiring more than three, one thousand foot reels to hold it ; photoplays of two and three reel length being termed "two-reelers" and ''three-reelers. ' '
Negative — The developed film, after being exposed in a camera.
Negative stock — Light sensitive film intended for motion picture . camera use.
Objective — The simple or compound lens nearest an object which forms an image of it.
Observation Port — An opening in the wall of the projection room through which the projectionist observes the screen.
Ohm — ^A unit of measure of resistance, reactance and impedance in a conductor to the passage of an electric current.
Optical Axis — The straight line through the centers of the light source, lenses, diaphragm, etc., of an optical system, to A\hich their planes are in general perpendicular.
Optical Scratch — Any particle of dust or mechanical imperfection in the slit wdll be imaged on the sound track and have much the same effect as a scratch on the sound track parallel to the edges of the film. This is called an optical or shadow scratch.
Optical Wedge — A device wiiich varies progressively in absorption of light from end to end. Sometimes used as a device for varying exposure in sensitometry.
Orthochromatic emulsion — One which is made sensitive to yellow and green as w^ell as blue and violet.
Orthochromatic Photography — Photography in wiiich colored objects are rendered in monotone according to their true visual brightness.
Oscillograph — A device for recording vibrations of high frequency.
Panchromatic — Eef erring to emulsions which are made sensitive to the entire visible spectrum.
Panoram — To rotate a motion picture camera about an axis perpendicular to the tripod top.
Phase — In uniform circular motion, simple harmonic motion, or in the periodic changes of any magnitude varying according to a simple harmonic law (as sound vibrations, alternating electric currents, etc.) the point or stage in the period to which the rotation, oscillation, or variation has advanced, considered in its relation to a standard position or assumed instant of starting.