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John Bigelow
John Bigelow , 1817-1911, American editor, author, and diplomat, b. Malden, N.Y. In 1838 he was admitted to the New York bar. From 1848 to 1861 he shared with William Cullen Bryant the ownership and editing of the New York Evening Post. His antislavery and free trade editorials were especially v...
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Richland
Richland city (1990 pop. 32,315), Benton co., S Wash., at the confluence of the Columbia and Yakima rivers, in an irrigated farm and vineyard region; inc. 1958. It is the headquarters of the U.S. Department of Energy's Hanford Nuclear Reservation (620 sq mi/1,606 sq km), on which the city's economy...
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Stonehenge
Stonehenge , group of standing stones on Salisbury Plain, Wiltshire, S England. Preeminent among megalithic monuments in the British Isles, it is similar to an older and larger monument at Avebury . The great prehistoric structure is enclosed within a circular ditch 300 ft (91 m) in diameter, wit...
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altimeter
altimeter , device for measuring altitude. The most common type is an aneroid barometer calibrated to show the drop in atmospheric pressure in terms of linear elevation as an airplane, balloon, or mountain climber rises. It shows height above sea level, but not above such land features as hills, m...
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ampere
ampere , abbr. amp or A, basic unit of electric current. It is the fundamental electrical unit used with the mks system of units of the metric system . The ampere is officially defined as the current in a pair of equally long, parallel, straight wires 1 meter apart that produces a force of 0.0000...
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galvanometer
galvanometer , instrument used to determine the presence, direction, and strength of an electric current in a conductor. All galvanometers are based upon the discovery by Hans C. Oersted that a magnetic needle is deflected by the presence of an electric current in a nearby conductor. When an elect...
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thermocouple
thermocouple An instrument that turns heat into an electric current. It consists of two wires of different metals joined together at their ends. When heat falls on one of the junctions while the other junction is kept cold, an electric current is produced. A thermocouple thus acts as a thermometer f...
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Hyades
Hyades , in astronomy, open star cluster in the constellation Taurus, located immediately to the right of the bright star Aldebaran. The cluster is about 130 light-years from the earth. It consists of about 100 stars all moving in the same direction. Its shape is that of an oblate spheroid, with m...
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speedometer
speedometer instrument that indicates speed. A cable from an automotive speedometer is attached to the rear of the transmission of an automobile; the cable turns at a rate proportional to the speed of the car. In a very common type of speedometer the other end of the cable is attached to a simple m...
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tachometer
tachometer , instrument that indicates the speed, usually in revolutions per minute, at which an engine shaft is rotating. Some tachometers, especially those used in automobiles, are similar in construction and operation to automotive speedometers . Other types, often connected directly to the shaf...
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