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Orbiting Geophysical Observatory

(Encyclopedia)Orbiting Geophysical Observatory (OGO), series of six orbiting observatories (see observatory, orbiting) launched between 1964 and 1969 by the National Aeronautics and Space Administration (NASA) to s...

tuning fork

(Encyclopedia)tuning fork, steel instrument in the shape of a U with a short handle. When struck it produces an almost pure tone, retaining its pitch over a long period of time; thus it is a valuable aid in tuning ...

calliope, in music

(Encyclopedia)calliope, in music, an instrument also called steam organ or steam piano in which steam is forced through a series of whistles controlled by a keyboard. It is usually played mechanically, and its shri...

Campbell, John Francis

(Encyclopedia)Campbell, John Francis, 1822–85, Scottish Gaelic scholar. He is known for Popular Tales of the West Highlands (4 vol., 1860–62) and Leabhar na Feinne (1872), a collection of Gaelic folk ballads. A...

quadrant, in technology

(Encyclopedia)quadrant, in technology, angle-measuring device based on a scale of 90°. It is sometimes confused with the sextant, a similar instrument based on a scale of 60°. The quadrant is rarely used today. ...

dulcimer

(Encyclopedia)dulcimer dŭlˈsĭmər [key], stringed musical instrument. It is a wooden box with strings stretched over it that are struck with small mallets. The number of strings may vary. The dulcimer is related...

compass

(Encyclopedia)compass. 1 In mathematics, an instrument for making circles and measuring distances. Frequently called a pair of compasses, it consists of two metal legs with one end of each attached to a pivot to fo...

voltmeter

(Encyclopedia)voltmeter, instrument used to measure differences of electric potential, commonly called voltage, in volts or units that are multiples or fractions of volts. A voltmeter is usually combined with an am...

Moore

(Encyclopedia)Moore, city (1990 pop. 40,761), Cleveland co., central Okla., a suburb of Oklahoma City; settled 1889 as Verbeck, renamed Moore, inc. 1893. Its manufactures include lightning- and surge-protection equ...

Marvin, Charles Frederick

(Encyclopedia)Marvin, Charles Frederick, 1858–1943, American meteorologist, b. Putnam (now part of Zanesville), Ohio, grad. Ohio State Univ., 1883. He entered (1884) the U.S. Signal Service, predecessor of the We...