-1.4- . 
7,- RECTIFICATION 
7.1 - Identification of the slotted templet points on the film 
This was achieved by setting the photograhs one by one 
under the films on a light table, When necessary for better identi 
fication the adjacent photos were observed with a magnifying glass. 
The points were dotted with washable ink, on the back 
of the films, 
7.2 - Rectification 
In jobs of this nature it is advisable to determine the 
settings of the 5 freedom degrees of the rectifier for all the exp£ 
sures of one or more strips. This was done by using the l/lO.OOO 
control bands. Next, after removing all the ink dots from the films, 
the photography stage was executed. 
Dry rectification and double weight ^emi matte paper were 
used. Due to the paper texture, the stability coefficient changes 
with direction, Thus, the photographic paper was always placed in 
the same position on the easel table. 
What matters in practice is to determine which correc 
tion should be applied to ensure the best possible correspondence 
in the mounting, viz, after spreading the glue. Several trials were 
made in order to find out the average correction scale factor which^ 
therefore, also included the displacement due to the thickness of 
the flattening glass, and the average development variation. 
7.3- Marking and checking the rectified photographs 
After identifying and pricking all the slotted templet 
points on the l/l0,000 rectified photographs a quick orientation of 
doubtful prints underneath the transparent band enabled a check to 
be made on any mistakes resulting from an erroneous setting in the 
rectifier. 
3c- BASES FOR THE MOSAICS 
Naturally the lay out of the mosaics should have been 
according to the flight direction, but the M.F.P.Z, wanted them o- 
rientated along the meridians and parallels, as shown in fig. 3. 
Each mosaic is 3' latitude by 3’ longitude, which makes 
them approximately 55 x 53 cms, at the l/l0,000 scale. The total 
number of mosaics was 286, Mounting the mosaics one. by one as nor 
mally done would take an excessive amount of time. Thus, we pro- 
ceded as follows: