. The Bell System technical journal . U tuO1^ INSTRUMENTS FOR THE NEW TELEPHONE SETS 341 and the caps relative to the handle is unnecessary. The spacingbetween the transmitter and receiver is such that the handset can beused with the existing type of desk mounting as well as with the newcombined set. Desk Stand and Wall Set ApplicationsThe photograph, Fig. 1, also shows the new transmitter and receiverunit adapted to desk stand and wall set use. Cross-sections of theseinstruments are shown on Fig. 3. The faceplate, mouthpiece and pro- TRANSMITTERUNIT. Fig. 3—Cross-sections of the transmitter a
. The Bell System technical journal . U tuO1^ INSTRUMENTS FOR THE NEW TELEPHONE SETS 341 and the caps relative to the handle is unnecessary. The spacingbetween the transmitter and receiver is such that the handset can beused with the existing type of desk mounting as well as with the newcombined set. Desk Stand and Wall Set ApplicationsThe photograph, Fig. 1, also shows the new transmitter and receiverunit adapted to desk stand and wall set use. Cross-sections of theseinstruments are shown on Fig. 3. The faceplate, mouthpiece and pro- TRANSMITTERUNIT. Fig. 3—Cross-sections of the transmitter and receiver for desk stands and wall sets. tective grid of the transmitter are combined in one phenol plastic partwhich is so designed as to reduce cavity resonance to a minimum andprovide response characteristics essentially the same as those of thehandset transmitter. On the other hand, the mouthpiece is sufficiently 342 BELL SYSTEM TECHNICAL JOURNAL prominent to encourage the user to talk directly into it and in thisway reduce the losses which often result when flush type faceplates areemployed with desk stand and wall set instruments. A phenol plasticpart, equipped with contact springs, holds the unit tightly in the face-plate and provides electrical connections. As in the handset the unit of the receiver is held in place by the are provided in the shell for bringing out the electrical con-nections. A metal insert adds sufficient weight to meet the switch-hook requirements of the existing sets. The phenol plastic parts ofboth
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
