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mandolin

(Encyclopedia)mandolin mănˌdəlĭnˈ, mănˈdəlĭnˌ [key], musical instrument of the lute family, with a half-pear-shaped body, a fretted neck, and a variable number of strings, plucked with the fingers or with...

barrel organ

(Encyclopedia)barrel organ, mechanical musical instrument requiring nothing but the regular rotary motion of a handle to keep it going. It probably originated at the beginning of the 18th cent., and was once used e...

Perrine, Charles Dillon

(Encyclopedia)Perrine, Charles Dillon pərīnˈ [key], 1867–1951, American astronomer, b. Steubenville, Ohio. He was on the staff of Lick Observatory (1893–1909) and was (1909–36) director of the Argentine Na...

Brady, Mathew B.

(Encyclopedia)Brady, Mathew B., c.1823–96, American pioneer in photography, b. Warren co., N.Y. Brady learned the daguerreotype process from S. F. B. Morse and in 1844 opened his own photographic studio in New Yo...

Watkins, Carleton Eugene

(Encyclopedia)Watkins, Carleton Eugene, 1829–1916, America's premier 19th-century landscape photographer, b. Oneonta, N.Y. Watkins created images that helped define the American West for his contemporaries and th...

Schneemann, Carolee

(Encyclopedia)Schneemann, Carolee, 1939–2019, American multimedia artist, b. Fox Chase, Pa., B.A. Bard College, 1959, M.F.A. Univ. of Illinois, 1961. Her art encompassed numerous genres, including painting, colla...

Newton, Sir Isaac

(Encyclopedia)Newton, Sir Isaac, 1642–1727, English mathematician and natural philosopher (physicist), who is considered by many the greatest scientist that ever lived. Newton was his university's representa...

Freundlich, Erwin Finlay

(Encyclopedia)Freundlich, Erwin Finlay froindˈlĭkh [key], 1885–1964, German astronomer. Freundlich obtained a doctorate in mathematics at Göttingen, then joined the Royal Observatory at Berlin, where he worked...

Froude, William

(Encyclopedia)Froude, William fro͞od [key], 1810–79, English engineer and naval architect, brother of J. Anthony Froude; educated at Oxford. In 1837 he worked on the Bristol and Exeter railroad, constructing the...

amplitude

(Encyclopedia)amplitude ămˈplĭto͞odˌ [key], in physics, maximum displacement from a zero value or rest position. In the harmonic motion of a pendulum, the amplitude of the swing is the greatest distance reache...