12 
The 2 nd pule: The outer longitudinal angle of inclination Ap/ ot 
the air photograph is always the sane, irrespective of 
the fact, in which stereogram this photograph is inclu- 
ded. 
We can represent this rule by the series of the following relations: 
Initial 
3 fcereogram 
/' 
st 
stereograa 
fiO 
ogO 
11 + fog1 s 'P/i+l/l + i Pog1 " 
2 nd 
stereogram 
3 rd 
stereogram 
“ f/1+1/2 * Pog2* 'P/i+2/2 + ¥*082 ‘ f/i+2/3 *f og} 
where the indexes are the same as in the I s * rule. 
3y introduction of these outer angles of inclination on the autograph 
we level the stereograms in the sequence of plotting and it is due to tho 
fact, that there are relations between the corresponding elements of the 
adjacent stereograms, 
rd 
The 3 rule: The flight height of the air photograph is always the 
same, irrespective of the fact in which stereogram 
this photograph is included. 
We can represent this rule by the series of the following relations: 
s t 
where the indexes are the same as in the 1 rule.