(676) 
in a ground photo, can often be localized exactly through comparison with à 
topical aerial photograph. 
After the return of the patrol, the films are developed and examined 
through magnifying-glasses by personnel who have good knowledge of the 
enemy's organization and equipment. While this is being done, the patrol leader 
and the photographer 
should be present. The 
targets can usually be 
ascertained from the 
negative, and only in 
exceptional cases is it 
necessary to make 
prints. 
It is not generally 
necessary to take meas- 
urements in order to 
identify the target, 
although it may some- 
times be to advantage 
to be able to measure 
de the dimensions of a 
Fig. 7. The fast reconnaissance photographer must be able to target. It is possible to 
work quickly and surely. Amateur cameras are easy to handle do this if one knows 
and are therefore used for this purpose. the focal length of the 
camera and the dis- 
tance at which the photo was taken, which, in its turn, may be determined 
through comparing the terrain objects of the ground photo with an aerial photo 
or map. 
Manuals containing drawings and photos of the enemy vehicle and gun 
types facilitate identification. Reconnaissance photos of such objects should be 
used to keep these manuals always up to date. 
  
Detailed Reconnaissance. 
Purposes. 
The purpose of detailed reconnaissance, is to photographically reconnoitre 
targets which cannot be discerned through ordinary reconnaissance without 
photograhs. It is quite natural that this form of intelligence must be carried out 
with greater photographic precision than in the case of fast reconnaissance, and 
the personnel employed must have been specially photographically trained and 
provided with good technical equipment. 
Equipment. 
The camera equipment must be first-class. The optics must be exchangeable, 
the lenses must be normal ones of about 6 in. (15 cm) and must be teleoptic with 
a focal length of up to about 1 metre. As an optical viewer, a frame sight or 
perhaps a telescope is desirable (see fig. 8). The lenses must be first-class ones, 
well color-corrected and constructed for quick changes between panchromatic 
  
ge » 
m f € vc Tu OO BO HR,