r 
PHOTOGRAMMETRIC ENGINEERING 
3 
rements as to 
.rget charts to 
, be it bomber, 
he availability 
flight use. 
m, the require- 
Fig. 4 
ments of the Department of the Army as to airborne equipment which will 
produce precision photography suitable for ground force large-scale maps. 
Photographic recordings available for compilation onto charts are of widely 
varying types. The T-ll, 6 inch precision mapping camera is perhaps the best 
answer to date. Preferably the T-ll would be in a stabilized mount capable of 
keeping X and Y tilt to a minimum. However, the Air Force Cartographer must 
be prepared to utilize reconnaissance photography of other focal lengths such as