error is in the camera orientation. The 10 second of arc capa- 
bility was determined in the field under the most optimum of 
operating conditions: 1) Star orientation of the negative; 
2) stabilized atmospheric conditions over a short period of 
time; 3) no time delay between orientation and reconstruction 
of direction, since the same negative frame was used for each 
phase of the test; 4) automatic compensation for residual re- 
fraction errors; 5) orientation of the entire negative and re- 
projection of the rays within the projective orientation bundle; 
6) reprojection of the rays within the distance limits of the 
orientation; 7) optimum star images for measurement. Compare 
these conditions with those existing for normal operations: 
1) dial orientation, the least accurate method; 2) unstable 
atmospheric conditions over extended periods of time; 3) ex- 
treme time delay between orientation and operation, daytime 
orientation and nighttime shoot; 4) extreme differences in 
atmospheric conditions and incomplete refraction compensation. 
This comparison could continue indefinitely if desired, but this 
will convey an idea of the situation. 
THE ASKANIA CINE-THEODOLITE SYSTEM 
The Askania Cine-theodolite is a precision tracking 
Instrument manufactured by the Askania Werke GMBH of Berlin,