Page:Popular Science Monthly Volume 92.djvu/509

 �The dicta- graph re - ceivers are put any- where they willbehandy. Here is one being placed in a tree top

��Crawling up to an enemy trench to place a trans- mitter, which is cunningly camouflaged in a battered tomato can

��Electrical Eaves dropping by the Sig- nal Corps

of the

United

States

Army

���Listening tor the sound of operations by enemy sappers. This often entails a great deal of danger and discomfort

��A trench re- ceiving sta- tion where the conver- sation and movements overheard by the transmit- ter are noted

��� �