the infra-red 
inters suc 
is deter- 
image, and 
is determined 
amount of 
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the positive’s 
more feet, but 
ition recorded 
formation and 
1a 1s required. 
sirable, lower 
d. It should 
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interpreters. 
robably give 
ation. Glazed 
early as good. 
surface “raises 
except under 
usc. 
aphs 1s related 
issumed that a 
nillimeters are 
e difficult and 
per millimeter 
film, exposed, 
per millimeter 
id illumination, 
ecome obvious 
he StCereosc« )pe 
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d photograph. 
ind the outside 
two adjoining 
not only to 
igles. They 
ower