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Edison
Edison township (1990 pop. 88,680), Middlesex co., NE N.J., inc. 1870 as Raritan Township, renamed 1954. Edison's varied manufactures include light trucks, chemicals, metal products, electrical and electronic equipment, machinery, and instruments. Raritan Center is the largest industrial park east ...
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Thomas Alva Edison
Thomas Alva Edison 1847-1931, American inventor, b. Milan, Ohio. A genius in the practical application of scientific principles, Edison was one of the greatest and most productive inventors of his time, but his formal schooling was limited to three months in Port Huron, Mich., in 1854. For several ...
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Fort Myers
Fort Myers city (1990 pop. 45,206), seat of Lee co., SW Fla., on the Caloosahatchee River, near the Gulf of Mexico; founded 1850, inc. 1905. It has a tourist trade and light industry and is a shipping point for citrus fruits, winter vegetables, flowers (especially gladioli), and fish. The city grew...
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Samuel Insull
Samuel Insull , 1859-1938, American public utilities financier, b. London. He arrived in the United States in 1881 and was employed by Thomas A. Edison as a private secretary. He later became prominent in the management of the Edison industrial holdings. By 1907 he overcame competing public utilit...
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thermionic emission
thermionic emission , emission of electrons or ions by substances that are highly heated, the charged particles being called thermions. The number of thermions emitted increases rapidly as the temperature of the substance rises. The heated material may be in the form of a metal filament or of so...
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goldenrod
goldenrod any species of the large genus Solidago of the family Asteraceae ( aster family), chiefly North American weedy herbs. They have small yellow flowers clustered, often in panicles, along a wandlike stem. The few species that have white flowers are called silverrod. The goldenrods were, a...
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record player
record player or phonograph, device for reproducing sound that has been recorded as a spiral, undulating groove on a disk. This disk is known as a phonograph record, or simply a record (see sound recording ). In using a record player, a record is placed on the player's motor-driven turntable, ...
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learning disabilities
learning disabilities in education, any of various disorders involved in understanding or using spoken or written language, including difficulties in listening, thinking, talking, reading , writing, spelling, or arithmetic . They may affect people of average or above-average intelligence. Learnin...
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microphone
microphone device for converting sound into electrical energy, used in radio broadcasting, recording, and sound amplifying systems. Its basic component is a diaphragm that responds to the pressure or particle velocity of sound waves. The microphone, various forms of which were developed independent...
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telegraph
telegraph term originally applied to any device or system for distant communication by means of visible or audible signals, now commonly restricted to electrically operated devices. Attempts at long-distance communication date back thousands of years (see signaling ). As electricity came into grea...
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