196 



DELL SYSTEM TECHXICAL JOURNAL 



The receiving eiui mechanism for turning and ad\ancing the 

 cylinder is similar to that at the sending end. The parts peculiar to 

 the receiving end are shown in Fig. 8. They consist of the light 

 valve, which is in the middle of the photograph, and the lens for pro- 

 jecting the light from it upon the cylinder. The metal cylinder 



F^ig. 8 — \'ic\v of receiving end apparatus showing light valve and observation 

 microscope 



around wliicli the st-nsitixe photngraphic film is wrajJiX'd, appears at 

 the extreme right. The microscope and prism shown are used for 

 inspecting the light valve aperture for adjusting purposes. 



Electrical Circuits 



The essential parts of the electrical circuits used are shown in the 

 schematic diagrams, Kigs. 9 and 10, in which the various elements 

 which ha\e hecn dcscrilitMl |)ri\iously are sIkiwii in their relations to 

 each other. 



Certain portions of the electrical circuits deserve somewhat detailed 

 treatment. One of these is the amplilier-modulator system for the 

 picture channel, the other is the filter system cmplowd for separat- 

 ing the picture and synchronizing channels. 



