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,