figure 13.--Plctur« showlre cross raember ^1 Bfter it is attached 



to fr^seucri:. Kote i-oimd, hard rubber stops that teep 

 the CTQSB iceaber flnaly se&ted In the slotc, and the 

 short pins that do not allow the cross nenber to slide 

 back and forth, hut do ellcw the cross memher to rotate. 



Figure llt.-'A double- e3q» sure lUuGtrntlm; the sideways rotctlon 

 of caneras. 



Strobe Light and Power Pack 



The strobe light or speed flash used is 

 the "Sunlite 11" model manufactured by the 

 Her shey Manufacturing Co., Chicago, Illinois. 



The reflector made for this model caused 

 a "hot spot" or area of too much light in the 

 pictures, since it was designed to be used at a 



greater distance from the subject. Consequently, 

 a flat reflector of our own design was substituted, 

 and this reflector proved to be more satisfactory. 



Tlie strobe or speed flash power pack is 

 a part of the "Sunlite II" model. Two 6 -volt 

 batteries provide the electrical power to oper- 

 ate the digital-register and the solenoids that 

 trigger the shutters of the two cameras. 



Camera Assembly 



The camera assembly consists of two 

 "Exakta" cameras equipped with split-image, 

 eye-level viewfinders and f 2.5, 35 millimeter 



Figure 15. — A double -expo sure sho'^lnc the endwise rotation of the 



Angeneiux lenses and the film. 



The "Exakta" is a single lens reflex type 

 camera. The reflex principal allows the oper- 

 ator to see, in a mirror behind the lens, an 

 image of the scene to be photographed. The 

 lever wind feature of the "Exakta" is another 

 valuable time saver. The film used for these 

 tests was Panatomic-X. 



Automatic Features 



There are four automatic features: 

 (1) The solenoids, (2) the buzzer, (3) the digital - 

 register, and (4) the modified switch. 



Solenoids. --The solenoids are necessary 

 to trip the camera shutters simultaneously. 



