Cinematographic annual : 1930 (1930)

Record Details:

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REPRODUCTION IN THE THEATRE 393 such a manner as to follow the wave shape of the current, which completes the last step in recreating the original sound. The receiver used with the Western Electric system is known as 555-W. It consists of a duralumin diaphragm. The diaphragm is made of a single piece of sheet aluminum alloy 0.002 INPUT TRANS. T OUTPUT TRANS. T2 o— ^ z* 1 I — o 0 toe' 1 I ° i I o O 1(0 !•* o 4-2V-e»C0MQ ♦ PLATE SUPPLY (TO UTIINAL AMPWI'lCft) FIGURE 9 inches thick. This diaphragm (A) is shown in Fig, 10. To it is rigidly mounted a flat coil (B) of aluminum wire or ribbon 0.015 inches wide and 0.0002 inches thick, wound on edge. A thin coat of lacquer serves to insulate the turns from each other. It is the speech current circulating in this coil interacting with the magnetic field which forces the diaphragm in and out. The receiver has been so constructed that the diaphragm