camera. Vacuum device of photographic camera has two-positional 
switch of vacuum pressure for 40Ü and 800 water column inms , and this 
value is set in accordance with the film thickness. 
For quality control of the levelling in laboratory a controlling 
flat-parallel glass plate with calibrated grid is fitted in the 
special setting place of moving camera frame. The clearance between 
the surface of moving frame arid cailibrated grid in the setting 
place is about 0,1 mm. In the calibration process of photographic 
camera in the normal operation the cassettes get photoimages of 
calibrated grid. The calibration is done in static position 
(F.M.C.in"off" position) and with operating forward motion compen 
sator. This case the grid is photographed with the minimum expo 
sure. On the basis of the results of grid an operator of hardware 
computer and bv special programme calculates remaining distortions 
for deformations and bad levelling of t.he film in each cross-lines 
and its medium square value, which according to Laboratory investi 
gations does not exceed 6 jnkm. The example for computer calcula 
tions is indicated on picture 2. 
СНИМОК НОМЕР 4 
X0* 386 , 058 Y 0 * 235.780 
К X X s ,5991 13 <YY= ,994993 
искажения ПО ОСИ X 
Y /X 
-80 
-40 
'0 
♦ 40 
+ 80 
+ 8 0 
- .fit 2 
- , 0 0 } 
- ~202~ 
».031 
, 038 ' 
+ 40 
- . P 1 4 
- , P 3 5 
.000 
. 006 
.00 1 
0 
- . ? 3 4 
-.002 
- . 002 
* . 003 
-.031 
- 4 0 
.005 
.03 7 
.004 
» . 0 0 2 
- , 033 
-8 0 
.034 
.014 
,008 
.00 1 
- . 038 
ИСКАЖЕНИЯ ПО ОСИ У 
Y/X 
-80 
’ 0 
*40~ 
+ 30 
+8 0 
.332 
, 037 
,00 7 
».004 
- 1 0 0 6 
+40 
,006 
, 004 
,004 
,002 
-.*1? 
0 
.00 1 
. 00 2 
,005 
».004 
-.012 
-4 0 
-.001 
, 03 4 
.002 
».002 
* « 0 0 1 
-8 0 
-.012 
-.003 
,006 
» . 002 
,009 
0С т АТ0ЧННР 
ИС<А *ЕНИЯ 
СР. кв. 
СИСТ , 
СРЕДИ. 
(ММ I 
х 
0057 
0002 
00 4 4 
У 
, 0059 
.000 1 
.0 04 4 
Picture 2. Calculation of deformation and 
flatness of air survey film. 
non-