double-band telephone communication system
81Radio transmitter design — In plate modulation systems the voltage delivered to the stage is changed. As the power output available is a function of the supply voltage, the output power is modulated. This can be done using a transformer to alter the anode (plate) voltage.… …
82architecture — /ahr ki tek cheuhr/, n. 1. the profession of designing buildings, open areas, communities, and other artificial constructions and environments, usually with some regard to aesthetic effect. Architecture often includes design or selection of… …
83Central African Republic — a republic in central Africa: a member of the French Community. 3,342,051; 238,000 sq. mi. (616,420 sq. km). Cap.: Bangui. Formerly, Central African Empire, Ubangi Shari. * * * Central African Republic Introduction Central African Republic… …
84Mozambique — /moh zam beek , zeuhm /, n. 1. Formerly, Portuguese East Africa. a republic in SE Africa: formerly an overseas province of Portugal; gained independence in 1975. 18,165,476; 297,731 sq. mi. (771,123 sq. km). Cap.: Maputo. 2. a seaport on an… …
85Afghanistan — /af gan euh stan /, n. a republic in central Asia, NW of India and E of Iran. 23,738,085; 250,000 sq. mi. (647,500 sq. km). Cap.: Kabul. * * * Afghanistan Introduction Afghanistan Background: Afghanistan s recent history is characterized by war… …
86Morse code — Chart of the Morse code letters and numerals Morse code is a method of transmitting textual information as a series of on off tones, lights, or clicks that can …
87motion picture, history of the — Introduction history of the medium from the 19th century to the present. Early years, 1830–1910 Origins The illusion of motion pictures is based on the optical phenomena known as persistence of vision and the phi phenomenon. The first …
88Advertising — This article is about the form of communication. For other uses, see Advertiser (disambiguation). Advert redirects here. For the band featuring musician Gaye Advert, see The Adverts. For content guidelines on the use of advertising in Wikipedia… …
89Timeline of historic inventions — The timeline of historic inventions is a chronological list of particularly important or significant technological inventions. Note: Dates for inventions are often controversial. Inventions are often invented by several inventors around the same… …
90The Division Bell — This article is about the Pink Floyd album. For the bell that is rung in the British Houses of Parliament, see Division bell. The Division Bell Studio album by Pink Floyd …
