The same illustration depicts the manner in which the negative is oriented 
and subsequently scanned in the Electronic Rectifier. 
The aerial negative is aligned with its principle line oriented along 
the elongated axis of the transparent copy table and is illuminated under= 
neath by a curved mercury vapor flourescent lamp. The curved copy table is 
  
of constant radius with respect to the apex of the oscillating mirror. The 
photograph is thus scanned at 500 lines per inch per minute and subsequently 
  
tranduced into electrical signals, The electrical signals produced are 
used to modulate the light output of the Ultrosonic Light Modulator unit 
illustrated in Fig. #3. 
Two photomultiplier tubes are used in the Electronic Rectifier. The | 
first photomultiplier picks up the sharp beam representing the scanned | 
| 
element passing through the aperature opening. A current is generated pro- 
  
  
portional to the intensity of light transmitted through the negative. 
This current in turn generates a voltage which is amplified and tone come 
pensated (shaped) to give the desired tonal characteristics in the resti- | 
tuted photograph. This modified video (shaped voltage) in turn modulates 
a high frequency carrier, which subsequently operates the Ultrasonic Light 
  
Modulator, The Ultrasonic Light Modulator in this application functions 
as a light valve where the transmitted light is proportional to the ampli- | 
tude of modulated input signal. The beam of transmitted light exposes, |i 
recording cylinder, A second photomultiplier receives information from a 
reflected light beam covering a larger area of the illuminated megative. 
  
  
" Spread through a number of years. 
  
  
     
   
   
   
   
   
   
    
   
   
  
   
   
   
   
   
   
   
    
   
   
   
    
   
element for element the photosensitive material mounted on the rotating i