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Beginning with the rivalry that the disc jockey is "dance music's most vital figure," Brewster and Broughton persuasively argue that the modern DJ is the epitome of the postmodern artist and that disc jockeys have lengthy encouraged the evolution of yank musical tastes. Brewster and Broughton's ardent historical past is considered one of boundaries and sonic booms, spanning nearly a hundred years, together with nods to pioneers Christopher Stone, Martin Block, Douglas "Jocko" Henderson, Bob "Wolfman Jack" Smith and Alan "Moondog" Freed. alongside the strains of Kurt B. Reighley's fresh searching for the precise Beat: The artwork and tradition of the DJ, this can be an obsessively unabridged and ever-unraveling (the authors will provide updates at www. djhistory. com) chronology of DJs and the musicAnorthern soul, reggae, disco, hip-hop, storage, condominium and technoAthey have fostered, and, extra thoroughly maybe, the track that has fostered them. in order to not pass over a word, the authors, either former editors at Mixmag united states and contributing writers to The Face, interviewed greater than a hundred DJs, dancers and scenesters and elicited a few bright, pull-quote anecdotes, specifically within the hip-hop chapters. What involves mild is sensible: readers study that the DJ is a quite American invention (Reginald A. Fessenden in 1906), yet they got here into their very own, and into wealth and popularity, in Britain (case in aspect: Paul Oakenfold). Brewster and Broughton's subtext is fresh: instead of draw curt traces among American and British contributions, they convey how intimate the nations have been in forging a communications phenomenon. (Aug. )
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Extra info for AN 08-10-94 SCR-578-A,B Radio Transmitter (maint.) (Mil TM)
The Antigua experiments described in the preceding chapter reveal the existence of a type of low duct which seems to be characteristic of maritime air. It appears probable that similar ducts are permanent in the oceanic regions of many parts of th^ earth. The relative humidity of the air at Antigua was found to be 60 to 80 per cent, indicating that a continuous upward diffusion of moisture must take place, since the air immediately adjacent to the water surface is always practically saturated. On the other hand, there is little difference between the air and sea tempera tures in this case, the ocean being about 25 C while the air temperature varies between 23 and 26 C.
With a substandard Μ curve the electromagnetic field near the earth surface is diminished instead of increased, a case opposite to that of superrefraction. In practice this weakening of the field not uncom monly leads to a more or less complete radio blackout. Fog, however, does not always produce a sub standard Μ curve although that is usually the case. In certain less frequent types of fog, the temperature and saturation vapor pressure may be constant or 41 equilibrium between the air and the water surface will again be reached.
The first measure ments were made in 1942, and experiments on a very large scale were carried out in 1944. ^' ιο· i " . i s a χ^^. optical transmission paths were operated in 1943, a 22-mile path over the sea and a 45-mile path over land. A 10-cm continuous signal was used, and the strength was monitored by means of thermistors. The antennas were dipoles with 30-in. parabolic reflec tors. The received signal was automatically recorded on meters having a range of 60 db. The signals received were correlated with meteorological observa tions, the results of which will be given below.