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| Manual computing device consisting of a frame holding parallen rods strung with movable counters. |
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| Pertaining to a circuit or device having an output that is proportional to the input. |
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| Mechanical calculator invented by Blaise Pascal in 1640. |
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| A 4.72-inch disc developed by Sony & Philips that can store, on the same disc, stero or two separate sound tracks plus digital program & information files. |
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| Vacuum tube designed by Lee deForest in 1904. |
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| Algebra in which elemets have one of two values & the algebraic operations defined on the set are logical OR, a type of addition, & logical AND, a type of multiplication. |
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| Long horizontal row of lights above the stage for general lighting. |
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| In terms of computer programming, a defect in the code or routine of a program. |
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| Darkened chamber in which the real image of an object is received through a small opening or lens & focused in natural color onto a facing surface rather than recorded on a film or plate. |
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| An official, usually periodic enumeration of a population, often including the collection of related demographic information. |
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| Machine, combining magic lantern & kinetoscope features, for projecting on a screen a series of pictures, moved rapidly (25 to 50 a second) & intermittenly before an objective lens, & producing by persistence of vision the illusion of continuous motion; a moving-picture machine; also any of several other machines or devices producing moving pictorial effects. |
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| Device used to capture sound via a capacitor with one plate fixed & the other forming the diaphragm moved by sound waves. |
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| Early variety of photograph, produced on a silver plate, or copper plate covered with silver, & rendered sensitive by the action of iodine, or iodine & bromine, on which, after exposure in the camera, the latent image is developed by the vapor of mercury. |
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| Computer that performs calculations & logical operations with quantities represented as digits, usually in the binary number system. |
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| Early phonograph records, first made by Thomas Edison, which utilized was cylinder media. |
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| Row of lights across the front of the stage. |
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| Period of economic crisis begining with the stock market crash in 1929 & continuing through the 1930s. |
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| Name given to the result of the first photographic experiments of Joseph Nicephore Niepce. |
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| Printing done with a plate bearing an image or design carved into or beneath the plate's surface. |
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| Any of various oxides of iron, such as ferric oxide or ferrous oxide, used in the manufacture of magnetic tape. |
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| Machine for the production of motion pictures in which film carrying successive instantaneous views of a moving scene travels uniformly through the field of magnifying glass. The observer sees each picture, momentarily, through a slit in a revolving disk, & these glimpses, blended by persistence of vision, give the impression of continuous motion. |
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| Machine for the projection of chronophotographs upon a screen for the purpose of producing the effect of an animated picture. |
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| Process of printing from a raised inked surface. |
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| Trademark used for a machine that sets type on a metal slug, operated by a keyboard. |
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| Printing process in which the image to be printed is rendered on a flat surface, as on sheet zinc or aluminum, & treated to retain ink while the non-image areas are treated to repel ink. |
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| Name given to the magnetic tape recording machine developed in Germany by AEG in the 1930s. |
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| Of or pertaining to shipping or navigation on the sea. |
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| Intergrated circuit that contains the entire central processing unit of a computer on a single chip. |
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| MIDI (Musical Instrument Digital Interface) |
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| Standard for representing musical information in a digital format, or software that conforms to this standard, used for composing & editing electronic music. |
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| Trademark used for a typesetting machine operated from a keyboard that activates a unit that casts & sets individual characters. |
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| Telegraphic code, consisting of dots, dashes, & spaces, invented by Samual B. Morse. The Alphabetic code which is used in North America is as follows: in length, or duration, one dash is theoretically equal to three dots; the space between the elements of a letter is equal to one dot; the interval in spaced letters. There are no spaces in any letter composed wholly or in part of dashes. |
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| Type in which each character is cast on a separate piece of metal. |
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| Instrument for the mechanical registration & reproduction of audible sounds, as articulate speech, etc. It consists of a rotating cylinder or disk covered with some material easily indented, as tinfoil, carrying a stylus. As the plate vibrates under the influence of a sound, the stylus makes minute indentations or undulations in the soft material, & these, when the cylinder or disk reproduce the sound. |
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| Preparation of manuscript for printing by the projection of images of type characters on phonographic film, which is then used to make printing plates. |
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| Sheet of metal, plastic, rubber, paperboard, or other material prepared for use as a printing surface, such as an electrotype or a stereotype. |
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| Sound system designating sound transmission from two sources through two speakers. |
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| Row of lights usually mounted in a trough reflector & placed in the wings to illuminate specific areas of interest on stage. |
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| Trademark used for a method of making color motion pictures in which films sensitive to different primary colors are exposed simultaneously & are later superimposed to produce the full-color print. |
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| Communications system that transmits & receives simple unmodulated electric impulses, especially one in which the transmission & reception stations are directly connected by wires. |
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| Instrument that converts voice & other sound signals into a form that can be transmitted to remote locations & that receives & reconverts waves into sound signals. |
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| Recording of live radio shows & interviews, pressed to phonographic discs for radio station play; used in the era before tape recording. |
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| Small electronic device containing a semiconductor & having at least three electrical contacts, used in a circuit as an amplifier, detector, or switch. |
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| To set written material into type; compose. |
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| Electron tube from which all or most of the gas has been removed, permitting eletrons to move with low interraction with any remaining gas molecules. |
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| Early technique in commercial filmmaking in which the accompanying sound for a motion picture was recorded on discs, then replayed on a large turntable that was synchronized with a film projector. |
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| Term originally used to describe what became known as radio. |
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