. The Bell System technical journal . new instruments. handle and the transmitter and receiver caps. In designing theseparts particular attention has been paid to providing adequate cross-sections at the points of maximum stress and to distributing theweight so as to reduce to a minimum the breaking moments which aredeveloped when the handset is dropped. The transmitter and re-ceiver caps serve the dual purpose of holding the units in place andproviding mechanical protection. In addition they thoroughly insu-late the user from all the metal parts which are included in the electricalcircuit. Bo
. The Bell System technical journal . new instruments. handle and the transmitter and receiver caps. In designing theseparts particular attention has been paid to providing adequate cross-sections at the points of maximum stress and to distributing theweight so as to reduce to a minimum the breaking moments which aredeveloped when the handset is dropped. The transmitter and re-ceiver caps serve the dual purpose of holding the units in place andproviding mechanical protection. In addition they thoroughly insu-late the user from all the metal parts which are included in the electricalcircuit. Both caps have smooth surfaces which can be readily will be pointed out later, the grid of the receiver cap also has atransmission function and plays an important part in determining theresponse in the upper frequency range. Spring contacts are providedto facilitate the assembly of the units in the handle. This operationis further facilitated by the fact that specific alignment of the units 340 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
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
