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ballistics

(Encyclopedia)ballistics bəlĭsˈtĭks [key], science of projectiles. Interior ballistics deals with the propulsion and the motion of a projectile within a gun or firing device. Its problems include the ignition a...

seeing

(Encyclopedia)seeing, in astronomy, the clarity with which stars and other celestial objects can be observed. It is primarily determined by the atmosphere of the earth. The most obvious phenomenon is twinkling, whe...

Balla, Giacomo

(Encyclopedia)Balla, Giacomo, 1871–1958, Italian painter, one of the founders of futurism. He moved from Turin to Rome in his twenties and began painting in a realist style. He travelled (1900) to Paris, where he...

Oberholtzer, Ellis Paxson

(Encyclopedia)Oberholtzer, Ellis Paxson ōˈbərhōltˌsər [key], 1868–1936, American historian, b. Chester co., Pa. He studied abroad and then worked on various Philadelphia newspapers. He edited the Manufactur...

Mariotte, Edme

(Encyclopedia)Mariotte, Edme ĕdˈmə märyôtˈ [key], 1620?–1684, French physicist. His De la nature de l'air (1676) includes a statement of Boyle's law (see gas laws), which he discovered independently and whi...

Fourier, Jean Baptiste Joseph, Baron

(Encyclopedia)Fourier, Jean Baptiste Joseph, Baron, 1768–1830, French mathematician and physicist. He was noted for his researches on heat and on numerical equations. He originated Fourier's theorem on vibratory ...

antihistamine

(Encyclopedia)antihistamine ănˌtĭhĭsˈtəmēn [key], any one of a group of compounds having various chemical structures and characterized by the ability to antagonize the effects of histamine. Their principal u...

Bradley, James

(Encyclopedia)Bradley, James, 1693–1762, English astronomer. His discovery of the aberration of light, announced in 1728, provided an important line of evidence for the motion of the earth around the sun. In 1742...

steam engine

(Encyclopedia)CE5 Steam engine steam engine, machine for converting heat energy into mechanical energy using steam as a medium, or working fluid. When water is converted into steam it expands, its volume increa...

memory, in psychology

(Encyclopedia)memory, in psychology, the storing of learned information, and the ability to recall that which has been stored. It has been hypothesized that three processes occur in remembering: perception and regi...