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Geiger counter

(Encyclopedia)Geiger counter or Geiger-Müller (G-M) counter gīˈgər-mŭlˈər, –myo͞oˈlər [key], instrument for the detection and quantitative determination of ionizing radiation such as the alpha and beta ...

drum, in music

(Encyclopedia)CE5 Drums drum, in music, percussion instrument, known in various forms and played throughout the world and throughout history. Essentially a drum is a frame over which one or more membranes or sk...

Cohen, Leonard Norman

(Encyclopedia)Cohen, Leonard Norman, 1934–2016, Canadian songwriter, singer, and poet, b. Montreal, B.A. McGill Univ., 1955. He initially wrote poetry, publishing his first collection, Let Us Compare Mythologies,...

eyeglasses

(Encyclopedia)eyeglasses or spectacles, instrument or device for aiding and correcting defective sight. Eyeglasses usually consist of a pair of lenses mounted in a frame to hold them in position before the eyes. Th...

sundial

(Encyclopedia)sundial, instrument that indicates the time of day by the shadow, cast on a surface marked to show hours or fractions of hours, of an object on which the sun's rays fall. Although any object whose sha...

Grossman, David

(Encyclopedia)Grossman, David, 1954–, Israeli writer and peace activist, b. Jerusalem. He is widely recognized as the finest novelist in the generation that followed Amos Oz and A. B. Yehoshua. The son of a Polis...

Beuys, Joseph

(Encyclopedia)Beuys, Joseph yōˈzĕf bois [key], 1921–86, German artist, b. Krefeld; one of the most influential of postmodern artists. Drafted into the Luftwaffe during World War II, he was wounded several time...

Morse, Samuel Finley Breese

(Encyclopedia)Morse, Samuel Finley Breese, 1791–1872, American inventor and artist, b. Charlestown, Mass., grad. Yale, 1810. He studied painting in England under Washington Allston and achieved some success. He r...

galvanometer

(Encyclopedia)CE5 Galvanometer galvanometer gălˌvənŏmˈətər [key], instrument used to determine the presence, direction, and strength of an electric current in a conductor. All galvanometers are based upo...

pneumatic tool

(Encyclopedia)pneumatic tool no͝omătˈĭk [key], instrument activated by air pressure. Pneumatic tools are designed around three basic devices: the air cylinder, the vane motor, and the sprayer. The air cylinder ...