A RECENT RECEIVER. 141 



too quickly or too slowly, and the motor is regulated 

 accordingly. 



It will be seen that the wireless transmission of 

 pictures requires both delicate adjustment, and 

 accurately -built driving machinery. We are 

 depending on a movement of about the five-thou- 

 sandth part of an inch for our recording, and there 

 are a number of pieces of delicate apparatus, all 

 reciprocative, which require to- be in perfect 

 harmony. 



In all such work as this results can only be 

 obtained slowly, and progress is often only apparent 

 to those actually in touch with it. Time alone will 

 show to what extent wireless photo -telegraphy will 

 be of value. 





