STUDIES IX RADIO BROADCAST TRANSMISSION 193 



-^ ««s«sC Time 



Pig 37 — Slow record of signal detected from tone modulated transmission showing 



the night-time distortion. Made at Stamford, Conn., May 15, 1924, 2:25 a.m. Upper 



trace signal from vertical antenna receiver and lower trace signal from loop antenna 



receiver, timing , marks 2.6 seconds apart 



Loop 



148 



149 



150 



Antenna 



jv^^r\/yv^Y^wwv\A^/vw\/W> 



Fig. 38 — Wave form of signals corresponding to numbered positions indicated on 

 strips 2, 4, and 5, Fig. 37 



