PUBLIC ADDRESS SYSTEM AND LONG LINES 



157 



routes wherever possible. Fig. 10 shows the network of long distance 

 circuits which was set up for this occasion. The solid lines in this 

 figure indicate telephone circuits while the broken lines indicate tele- 

 graph circuits. The latter were for the purpose of transmitting orders 



gqjare 



Telephone Circuit 



Telegraph Order Wire 



O Telephone Repeater Pomi 



Fig. 10— Telephone and Telegraph Lines Used on Armistice Day, 1921 



between different units of the operating organization at different 

 points. 



At Arlington the nature of the ceremonies and the place in which 

 they were held presented many difficulties from the acoustic stand- 

 point. The main addresses were made in an open amphitheatre sur- 

 sounded by a double colonnade of maible. The platform on which 

 the speakers were located was partially covered by a marble arch. 

 The floor of the amphitheatre is of cement on which are arranged 

 marble benches. Temporary seats also were placed on top of the 

 colonnade. During the ceremonies large crow r ds surrounded the 

 amphitheatre on all sides. The arrangement of the amphitheatre 

 and the surroundings is shown by Fig. 11. 



In order that the crowds outside of the amphitheatre might hear 

 the speakers, loud speaking receivers and their associated projectors 

 were placed on top of the colonnade. They were arranged in four 

 groups as shown on Fig. 11, the projectors referred to, being num- 

 bered from 1 to 21 inclusive. Those in the east group were on top of 

 the structure forming the main entrance to the amphitheatre. The 



