■'IHF. STlilHOrilOXn." .-/.V m.ECTRICAI. STF.TIIOSCOl'F. 54S 



ill the viriiiit\- of a patient, the flesh and Ixyne stnirtiire vil)rates to 

 these sounds. Tliis is particularly true of ilie areas conimonly used in 

 aiisiultation. The transmitter, resting on the flesh, will pick «(> 

 these vibrations together with those originating in the body of the 

 patient. The instructor may, therefore, talk to his students by 

 directing his words at that portion of the body to which the trans- 

 mitter is applied. Best results are obtained with a talking distance 

 of aliout ten inches. During such annoimcements, it is essential, 



AMPHITHEATRE 



DISTRIBUTION 



SYSTEM 



WARDS 

 Fig. 1(V— Wiring installation for the rooms or the wards of a hospital 



of course, that the electrical filters be remo\ed from the circuit in 

 order that the important higher frequency components of speech 

 may be transmitted to the receivers. Because of this operating 

 feature, it is obviously necessary to have the patient in a reasonably 

 quiet place. 



It is often desirable to reproduce in the lecture hall, the heart and 

 chest sounds of confined patients too ill to be moved. For this pur- 

 pose, the r(X)ms or the wards of a hospital may be connected by a pair 

 of wires to the lecture room. Such an installation is shown in Fig. 10. 

 Terminal outlets are distributed throughout the rooms or the wards 

 as desired and all are connected to the main feeder wires which com- 

 municate with the lecture hall. It is necessary to take the stelho- 



