polarity mark
11Harmonium (poetry collection) — Harmonium is a book of poetry by U.S. poet Wallace Stevens. His first book, it was published in 1923 by Knopf in an edition of 1500 copies. He was in middle age at that time, forty four years old. The collection comprises 85 poems, ranging in… …
12Diode bridge — Three bridge rectifiers. The size is generally related to the current handling capability …
13Tertiary Period — Interval of geologic time, 65–1. 8 million years ago. It constitutes the first of the two periods of the Cenozoic Era, the second being the Quaternary. The Tertiary has five subdivisions: (from oldest to youngest) the Paleocene, Eocene, Oligocene …
14Shelby Steele and John E. Jacob: The State of Black America (1988) — ▪ Primary Source The civil rights movement of the 1950s and 60s represented the apogee of African American political unity. The effort to defeat Jim Crow (Jim Crow law) segregation and to promote federal legislation on behalf of civil… …
15Life Sciences — ▪ 2009 Introduction Zoology In 2008 several zoological studies provided new insights into how species life history traits (such as the timing of reproduction or the length of life of adult individuals) are derived in part as responses to… …
16Bass guitar — A Music Man Stingray bass String instrument Other names Bass, electric bass guitar, electric bass. Classification …
17Subwoofer — A subwoofer is a woofer, or a complete loudspeaker dedicated to the reproduction of bass audio frequencies, from perhaps 150 Hz down as far as 20 Hz, or in rare cases lower. Also known as subs , these are used to augment the low frequency… …
18Digital video testing — in broadcast video, for example, is the process of validating and verifying that the video content and other data is being correctly processed, stored and transported. Despite the fact that the data is digital, most digital tv (DTV) system… …
19concerto — /keuhn cher toh/; It. /kawn cherdd taw/, n., pl. concertos, concerti / tee/. Music. a composition for one or more principal instruments, with orchestral accompaniment, now usually in symphonic form. [1720 30; < It, deriv. of concertare; see… …
20Albert Schweitzer — For the documentary film, see Albert Schweitzer (film). Albert Schweitzer Born …
