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car sickness

(Encyclopedia)car sickness: see motion sickness. ...

Sitter, Willem de

(Encyclopedia)Sitter, Willem de vĭlˈəm də sĭtˈər [key], 1872–1934, Dutch astronomer and mathematician. He was professor from 1908 at the Univ. of Leiden and in 1919 became director of its observatory. His ...

impasto

(Encyclopedia)impasto ĭmpăsˈtō, –päˈstō [key], thickly applied paint that projects from the picture surface. Such works as Childe Hassam's Allies Day (1917; National Gall. of Art, Washington, D.C.) and Han...

Bone, Henry

(Encyclopedia)Bone, Henry, 1755–1834, English enamel painter. He decorated china at Plymouth and Bristol and later went to London, where he was employed in making small enameled pieces and miniatures. In 1780 he ...

shock absorber

(Encyclopedia)shock absorber, device for reducing the effect of a sudden shock by the dissipation of the shock's energy. On an automobile, springs and shock absorbers are mounted between the wheels and the frame. W...

vibration

(Encyclopedia)vibration, in physics, commonly an oscillatory motion—a movement first in one direction and then back again in the opposite direction. It is exhibited, for example, by a swinging pendulum, by the pr...

Fenton, Roger

(Encyclopedia)Fenton, Roger, 1819–69, English pioneer photographer. Originally a barrister, Fenton worked from the early 1850s until 1862 as a fashionable architectural, still-life, portrait, and landscape photog...

Smith, George Elwood

(Encyclopedia)Smith, George Elwood, 1930–, American physicist, b. White Plains, N.Y., Ph.D., Univ. of Chicago, 1959. Smith was a researcher at Bell Laboratories in Murray Hill, N.J., from 1959 until his retiremen...

Talbot, William Henry Fox

(Encyclopedia)Talbot, William Henry Fox, 1800–1877, English inventor of photographic processes (see photography, still). A man of enormously versatile intelligence, he invented the “photogenic drawing” proces...

silver nitrate

(Encyclopedia)silver nitrate nīˈtrāt [key], chemical compound, AgNO3, a colorless crystalline material that is very soluble in water. The most important compound of silver, it is used in the preparation of silve...