TRANS A T LAN TIC TELETHON V 



179 



antenna gives as much improvement as would an increase in power of 

 about 100 times. Furthermore, receiving at Houlton, Maine, rather 

 than in the vicinity of New York, by getting to a more northerly lati- 

 tude, is equivalent to a power increase of 50 times. The antenna loca- 

 tion and directivity, therefore, is equivalent to a transmitted power in- 

 crease of 5,000 times. The receiving set employed with these antennae 

 at Houlton is of a double demodulation type, of very high selectivity. 



Fig. 11 — Picture of receiving antenna in Cliffwood 



Fig. 11 shows a receiving antenna at Cliffwood, N. J., of the type 

 used for short waves. It is constructed of a wooden framework on 

 which are held two parallel sets of conductors made up by bolting 

 together lengths of copper tubing. Possibly you can make out the 

 form of the two sets of conductors. Each set consists of vertical 

 elements a quarter of a wave-length high and a quarter of a wave- 

 length between successive elements. The first element is connected 

 to the second by a conductor connecting the upper ends of the elements, 

 the second is connected to the third by a conductor connecting the 

 lower ends and so on. 



The whole effect gives a degree of directivity equivalent to an in- 

 crease in power of about 15 times. This general question of short 

 wave receiving is a fruitful field for investigation and for the ingenuity 

 of the engineers. A large number of arrangements have been devised 



