closed-circuit telegraph system
1Closed-circuit television — CCTV redirects here. For other uses, see CCTV (disambiguation). For the Chinese television station, see China Central Television. Surveillance cameras on a corner. Closed circuit television (CCTV) is the use of video cameras to transmit a signal… …
2telegraph — [tel′ə graf΄] n. [Fr télégraphe: see TELE & GRAPH: orig. used of a semaphore] 1. Obs. any signaling apparatus 2. an apparatus or system that converts a coded message into electric impulses and sends it to a distant receiver: originally, Morse… …
3postal system — System that allows persons to send letters, parcels, or packages to addressees in the same country or abroad. Postal systems are usually government run and paid for by a combination of user charges and government subsidies. There are early… …
4NLRB v. Mackay Radio & Telegraph Co. — NLRB v. Mackay Radio Telegraph Co. Supreme Court of the United States Argued April 5–6, 1938 De …
5Track circuit — A track circuit is a simple electrical device used to detect the presence or absence of a train on rail tracks, used to inform signallers and control relevant signals. Principles and operation The basic principle behind the track circuit lies in… …
6Nintendo Entertainment System — NES redirects here. For other uses, see NES (disambiguation). Family Computer redirects here. For the 1977 VideoBrain product, see VideoBrain Family Computer. Nintendo Entertainment System Nintendo Family Computer (Famicom) …
7Elisha Gray — Infobox Person name=Elisha Gray caption=Elisha Gray quotation= birth date=birth date|1835|8|2|mf=y birth place=Barnesville, Ohio dead=dead death date=death date and age|1901|1|21|1835|8|2|mf=y death place=Newtonville, MassachusettsElisha Gray… …
8printing — /prin ting/, n. 1. the art, process, or business of producing books, newspapers, etc., by impression from movable types, plates, etc. 2. the act of a person or thing that prints. 3. words, symbols, etc., in printed form. 4. printed material. 5.… …
9The Italian Job — Infobox Film name = The Italian Job caption = Theatrical release poster director = Peter Collinson writer = Troy Kennedy Martin starring = Michael Caine Noël Coward Benny Hill Raf Vallone Tony Beckley Rossano Brazzi John Forgeham Maggie Blye |… …
10Invention of radio — Great Radio Controversy redirects here. For the album by the band Tesla, see The Great Radio Controversy. Contents 1 Physics of wireless signalling 2 Theory of electromagnetism …
