132 BELL SYSTEM TECHNICAL JOURNAL 



The distribution effected from the College Point location appears 

 to be generally good. It does not cover the New Jersey suburbs as 

 strongly as might be desired. The shadow cast by the Manhattan 

 Island high buildings lies through Jersey City and lower Newark. 



The distribution from the West Orange site appears to be somewhat 

 less favorable. It is not sufficiently close in to deliver with moderate 

 power a very strong field to the center of the population, nor is it 

 sufficiently far out to avoid subjecting a considerable population in 

 the immediate vicinity of the station to an excessive field were high 

 power employed. The indent in the 10,000 juv. line in northern 

 Queens is the shadow of the Manhattan buildings. 



The distribution shown for the Walker Street location is seen to 

 be generally similar to that of West Street. The curve presents a 

 smoother appearance than the others because less data were taken in 

 this one of the earlier surv^eys. The shadows cast to the north and 

 to the south by the two areas of high buildings are prominent. 

 Actually, a close examination of the contour lines reveals a noticeable 

 angular displacement in the Westchester shadow as between Walker 

 Street and West Street, Walker Street transmitting better up the 

 Sound and West Street better up the Hudson. West Street turns 

 out to be somewhat the better of the two. 



The last diagram of the series brings together the shadows as deter- 

 mined from the several transmitting sites and shows that they project 

 back to a common general center which locates at approximately 38th 

 Street and Broadway, which corresponds quite well with the center 

 of the up-town tall building area. 



Relation between Wave Distribution and the Distribution 



OF Listeners 

 The merit of a given distribution pattern obviously depends upon 

 the relation which exists between it and the distribution of the receiving 

 sets themselves. In order to study this relation more closely, the 

 relative distribution of receiving sets was approximated by taking the 

 distribution of residence and apartment house telephones in each of 

 the central office districts of the metropolitan area, excluding the 

 commercial telephones. It was assumed that the receiving set dis- 

 tribution is proportional to that of the telephones. For a given survey 

 the field strength representative of each central office district is known. 

 By assembling the figures for central office areas receiving like field 

 strengths, and by doing this for the whole range of field strengths 

 measured, an accumulative percentage curve may be derived which 

 shows the percentage of the total number of receiving sets included 

 within the contour lines of successively weaker fields. 



