1902.] affecting the Transmission of Electric Waves. 2'6'9 



distance in the open sea, under the same circumstances, which circum- 

 stances include the direct connection of the aerial wire to one ball of 

 the induction coil used for transmission. 



The three following examples are typical cases. Units of distance 

 are given in lieu of nautical miles. 



(a.) A ship, A, steamed away from a station, B, to ascertain the 

 maximum distance at which she could receive signals in the open sea. 



At 48 units of distance, the signals weakened, at 57 they ceased, at 

 65 they appeared again, and were kept up to 100 units of distance. 



(b.) Four ships, C, D, E, F, steered as shown in the diagram, the 



Position I. 



maximum signalling distance between each pair being about 100 units 

 of distance. 



(The results of the signals transmitted by D are those specially to- 

 be considered.) 



In position (1) D's signals were received by E F, not by C. 



33 33 (2) 33 )j J) JJ jj F, ,, E C. 



3? 33 (3) 3 3 3 3 3 3 3 3 3 3 ^ F, E. 



C did not commence signalling before reaching (2) and her signals 

 were received by D and E, and maintained by them to position (3) 

 when the trial was finished. 



E's signals, which were few in number, were received by C and D in 

 (3), but not by D in (2). 



(c.) In the third example, ships D and F carried out a similar trial 

 independently. Between 45 and 55 similar units of distance no signals 

 could be exchanged either way, though at 60 units and above, and 

 below 40, the signalling was perfect. 



