﻿594 



Prof. J. A. Fleming on the Electric 



radii vectores of a polar curve; and these radii were therefore 

 proportional to the magnetic and electric fields of the radiator 

 taken at equal distances round its centre, but in various 

 azimuths. The reduced observations are given in Table I., and 

 from them the polar curves (see Plate XVII. figs. 1 to 5) 

 have been plotted. These show the results for five such experi- 

 ments when the transmitting antenna had its bend made at 

 various heights as indicated in the diagrams. 



Table I. 



Radiation from Bent Earthed Transmitting Antenna 20 feet 



in total length. 

 Receiving antenna vertical and 20 feet high. 

 Distance between receiver and transmitter, 138 feet. 



Length in feet of 



1 









Vertical part of 



5 



4 3 



2 



1 



Transmitter ... 



J 









Length in feet of 



u 









Horizontal part 



16 17 



18 



19 



of Transmitter. 



J 









Eadiated wave- 

 length in feet... 



1 100 



92(?) 105 



106 



110 



Azimuth of 



Current in the Receiving Antenna in 



horizontal part 





arbitrary units. 





of transmitter, 

 o 

 











100 



100 



100 



100 



100 



15 



98 



97 



94 



92 



93 



30 



92 



85 



96 



83 



75 



45 



82 



79 



79 



77 



67 



60 



78 



74 



70 



71 



58 



75 



77 



67 



59 



56 



45 



90 



72 



66 



57 



52 



48 



105 



71 



65 



57 



46 



41 



120 



70 



66 



62 



53 



49 



135 



72 



64 



60 



54 



48 



150 



73 



80 



58 



67 



59 



165 



70 



74 



56 



69 



60 



180 



82 



69 



64 



63 



68 



Plate XVII.... 



Fig. 1. 



Fig. 2. 



Fig. 3. 



Fig. 4. 



Fig. 5. 



The azimuths are reckoned in degrees counting from the 

 position in which the free end of the bent transmitting antenna 

 points directly away from the receiving wire. It will be 

 seen from the curves that the greatest fore and aft inequality 

 is obtained with this particular antenna bent so that 2 feet 

 of it is vertical and 18 feet horizontal, and that at the distance 



