. American telephone practice . is receiver is themethod of supporting the diaphragm, which is held in place in thecap B by the clamping ring B. Upon the cap, B, is screwed an ear-piece, B2, of hard lock-ring, B\ is adapted to be screwed against the cap, to lockit in any adjusted position on the casing Upon the rear of thecasing is provided a projection, A, against the faces of which restthe soft-iron cores, C and C2, which extend through the bottom ofthe casing and carry upon their end the coils, C3 C\ The ends ofthe permanent magnet, D D, rest upon the cores, C and C2, and asc
. American telephone practice . is receiver is themethod of supporting the diaphragm, which is held in place in thecap B by the clamping ring B. Upon the cap, B, is screwed an ear-piece, B2, of hard lock-ring, B\ is adapted to be screwed against the cap, to lockit in any adjusted position on the casing Upon the rear of thecasing is provided a projection, A, against the faces of which restthe soft-iron cores, C and C2, which extend through the bottom ofthe casing and carry upon their end the coils, C3 C\ The ends ofthe permanent magnet, D D, rest upon the cores, C and C2, and ascrew or bolt, £, passes through the ends of the magnet, the cores,and the projection, to maintain them in position. The ends of themagnet, d, are cut away as shown to permit the cores to be setflush with the inner faces of the magnet. Between the limbs of the magnet is provided a block, D, of fiberupon which are mounted two binding posts, D2, these being con-nected to the terminals of the coils by heavy insulated wires, D4 Z) FIG. RECEIVER. To the binding posts are also attached the ends of the receiver the rear of the casing, A, is provided a threaded flange uponwhich the insulated casing, or rubber shell, F, is screwed, this latterbeing provided with-an opening at the end through which the re-ceiver cord passes. The magnet is mounted rigidly upon the metal casing. A, therubber shell being entirely independent so that it may be removedby unscrewing. The diaphragm support or cap, B, may be raisedor lowered to adjust the diaphragm relatively to the magnet ring, Bs, serving to lock the diaphragm in its adjusted position. This receiver does away entirely with the troublesome effects dueto expansion or contraction. The insulating casing forms a handleand serves as a protection to the cord terminals, but forms no partof the working structure itself. Still another form of receiver, and one of the non-adjustable shown in Fig. 32; this is man
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Keywords: ., boo, bookcentury1900, bookdecade1900, bookidamericantelepho00mill
