Operator's Receiver

At the central office in telephone exchanges the operators are provided with receivers in order that they may communicate with the subscribers or with other operators. In order that they may have both of their hands free to set up and take down the connections and to perform all of the switching operations required, a special form of receiver is employed for this purpose, which is worn as a part of a head-gear and is commonly termed a head receiver . These are nece arily of very light construction, in order not to be burdensome to the operators, and obviously they must be efficient. They are ordinarily held in place at the ear by a metallic head band fitting over the head of the operator. Such a receiver is shown in cro -section in Fig. 57, and completely a embled with its head band in Fig. 58. Referring to Fig. 57 the shell 1 of the receiver is of aluminum and the magnets are formed of steel rings 2 , cro -magnetized so as to present a north pole on one side of the ring and a south pole on the other. The two L-shaped pole pieces 3 are secured by screws to the poles of these ring magnets, and these pole pieces carry the magnet coils, as is clearly indicated. These poles are presented to a soft iron diaphragm in exactly the same way as in the larger hand receivers, the diaphragm being clamped in place by a hard rubber ear piece, as shown. The head bands are frequently of steel covered with leather. They have a umed numerous forms, but the general form shown in Fig. 58 is the one commonly adopted. IMG:384091999325875926_fig058_t.gif.png:Illustration_ Fig. 58. Operator Fig. 58. Operator's Receiver and Cord View full size illustration. IMG:384091999325875926_fig059_t.gif.png:Illustration_ Fig. 59. Receiver Symbols Fig. 59. Receiver Symbols View full size illustration.