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Lancaster, John of Gaunt, duke of

(Encyclopedia)Lancaster, John of Gaunt, duke of: see John of Gaunt. ...

Aymer of Valence, earl of Pembroke

(Encyclopedia)Aymer of Valence, earl of Pembroke: see Pembroke, Aymer de Valence, earl of. ...

photoelectric effect

(Encyclopedia)photoelectric effect, emission of electrons by substances, especially metals, when light falls on their surfaces. The effect was discovered by H. R. Hertz in 1887. The failure of the classical theory ...

image

(Encyclopedia)image, in optics, likeness or counterpart of an object produced when rays of light coming from that object are reflected from a mirror or are refracted by a lens. An image of an object is also formed ...

Crossfield, Scott

(Encyclopedia)Crossfield, Scott (Albert Scott Crossfield), 1921–2006, American aviator, b. Berkeley, Calif. A fighter pilot and flight instructor in the navy (1942–46) during World War II, he studied aeronautic...

Nakamura, Shuji

(Encyclopedia)Nakamura, Shuji, 1954–, Japanese physicist and electronics engineer, grad. Univ. of Tokushima (D.Eng., 1994). Nakamura joined the Nichia Corporation in 1977, and it was there that he began his life-...

Knights of Saint John of Jerusalem

(Encyclopedia)Knights of Saint John of Jerusalem: see Knights Hospitalers. ...

Saint John of Jerusalem, Knights of

(Encyclopedia)Saint John of Jerusalem, Knights of: see Knights Hospitalers. ...

cutter

(Encyclopedia)cutter, small, one-masted sailing vessel, with a rig similar to that of a sloop except that it usually has a sliding bowsprit and a topmast. From 1800 to 1830 cutters were in service between England a...

machine tool

(Encyclopedia)machine tool, power-operated tool used for finishing or shaping metal parts, especially parts of other machines. An establishment that is equipped with such tools and specializes in such work is known...