MECHANISMS INVOLVED IN WIRELESS TELEGRAPHY. 



The lower figure shows a dynamo used in generating a current for transatlantic 

 messages. The middle figure shows the approved method of construction of towers 

 to carry the wires at a receiving station. The upper figure reproduces a photograph 

 taken at night at a wireless station. The electrical display so vividly recorded on the 

 photographic plate was altogether invisible to the eye. 



