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noise

(Encyclopedia)noise, any signal that does not convey useful information. Electrical noise consists of electrical currents or voltages that interfere with the operation of electronic systems. Electrical noise limits...

Oberlin, Russell Keys

(Encyclopedia)Oberlin, Russell Keys, 1928–2016, American countertenor, b. Akron, Ohio, grad. Juilliard, 1951. A boy soprano, he sang in his church choir and on the radio, and won a nationwide radio talent competi...

guided missile

(Encyclopedia)guided missile, self-propelled, unmanned space or air vehicle carrying an explosive warhead. Its path can be adjusted during flight, either by automatic self-contained controls or remote human control...

lock and key

(Encyclopedia)lock and key, fastening fitted to an entryway, such as a gate or door, or a container, such as a cabinet, drawer or safe, to keep it closed and/or prevent unauthorized access or use. Locks typically c...

Levallois-Perret

(Encyclopedia)Levallois-Perret ləvälwäˈ-pĕrāˈ [key], residential and industrial suburb of Paris (1990 pop. 47,788), Hauts-de-Seine dept., N central France, on the Seine River. Automobiles, electrical and rad...

Penticton

(Encyclopedia)Penticton, city (1991 pop. 27,258), S British Columbia, Canada, located where the Okanagan River flows into Okanagan Lake. It is a service and trade center for the Okanagan valley, a resort and fruit-...

Fleetwood

(Encyclopedia)Fleetwood, town, Lancashire, NW England, on Morecambe Bay at the mouth of the Wyre estuary. Fleetwood, a port, trades and has a ferry service with the I...

Rambouillet

(Encyclopedia)Rambouillet, town (1990 pop. 25,293), Yvelines dept., N France. It is a summer resort in the heart of a magnificent forest. Sheep are raised, and radio equipment and plastics are made. The nearby châ...

ophthalmology

(Encyclopedia)ophthalmology ŏfˌthălmŏlˈəjē [key], branch of medicine specializing in the anatomy, function and diseases of the eye. Ophthalmologists specialize in the medical and surgical treatment of eye di...

Farnsworth, Philo Taylor

(Encyclopedia)Farnsworth, Philo Taylor, 1906–71, American inventor, b. Beaver, Utah, grad. Brigham Young Univ., 1925. He demonstrated (1927) a working model of a television system. His “dissector tube” (calle...