We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
Glossary of Technical Terms 55
polarization is ii^ed as a means for vaiyiiig the brightness of comparison surfaces.
Masks — Opaque plates of various sizes and shapes used in cameras or projectors to limit the effective area of the picture.
Mechanical filter — A mechanical impedance or a combination of mechanical impedances so designed as to pass or suppress mechanical vibrations of certain frequencies.
Micro-Prefix — Meaning the millionth part of, as in micro-farad, micro-ampere, etc.
Microphone — A device for conversion of sound into electrical pulsations.
Microphone Amplifier — The first unit in the amplification chain, usually placed close to the microphone.
Microphone Mixer — An assembly of volume controls used for regulating the relative input signals from several microphones.
Milli — Prefix signifying the thousandth part of, as in millimeter, milli-volt, etc.
Modulation (Electrical) — The variation of amplitude of an alternating current in accordance with the amplitude of a second alternating current or complex wave. As used in sound recording practice the super-position of an alternating current on a direct current.
Monitor — (verb)— To control the volume of sound from a reproducing equipment.
Monitoring Loudspeaker — A loudspeaker located in the recording room and connected with the microphones on the set to permit the recordists to hear the sound being recorded. A similar loudspeaker is placed in the projection room to enable the projectionists to follow the sound reproduction.
Motion Picture — The representation of an object by the rapid presentation to the eye of a series of pictures showing the object at successive intervals of time.
Motion Picture Projector^ — A device for suitable projecting motion pictures.
Moving period — That portion of the picture cycle during which the film at the aperture is in motion. This period is expressed in degrees of revolution of the fly wheel when 360 degrees are equal to one Cycle.
Multiple Reel Picture — (As applied to 35 m/m film) — A photoplay