130 BELL SYSTEM TECHNICAL JOURNAL 



mental transmitting stations were established at each of several 

 suburban locations. Use was made of an automobile truck equipped 

 with a Y2 kw. broadcast transmitter and provided with a transportable 



Fig. 7 — Transportable field transiiniiing station 



mast. The experimental transmitter as set up at Secaucus, New 

 Jersey, is shown in Fig. 7. Measurements of the field strength 

 delivered from each of the locations chosen were made o\'er practically 

 the entire metropolitan area. The results of these tests are given in 

 Fig. 8, in comparison with those of transmission from the normal 

 location of WEAF at West Street and from the earlier location at 

 24 Walker Street. The measured field strengths have been adjusted 

 to correspond to the 5 kw. transmitter of the West Street station. 



The smaller irregularities in the West Street curve as compared with 

 the others are due to the greater detail with which these measurements 

 were made. The curves should be compared merely with respect to 

 their major contour characteristics. The inner contour line is for 

 50,000 MV./m. and the outer line for 10,000 ^v./m. Actually, the 

 measurements were made in sufficient detail to enable other contour 

 lines to be drawn, but these have been omitted for the sake of simplicity. 



The radiation from Secaucus will be seen to deliver a strong field 

 to Manhattan Island, the most densely populated section, and, in 

 general, to encompass the rest of the city quite well within the 

 10,000 MV. line. The irregularity in Queens County evidently repre- 

 sents the shadow cast by the tall building area on Manhattan Island. 



