se a It will be satisfactory and economical to have the ratio settings for the entire
picture material computed in advance in a Processing Section by assistant operators.
boint For this purpose, the displacement method employed in the United States seems
eof ' particularly appropriate ^).
point When this method is employed, the value and direction of picture tilt as well
two as the magnification value are determined in the following manner: Subsequent
opy- to a mechanical radial triangulation according to the slotted template method,
1ani- the distances of the lateral auxiliary points from the radial point in each picture
are checked against the scale lines determined by triangulation. With the aid of
diagrams, the process may be reduced to an appropriate schematic form which can
ting be handled by assistant personnel.
car- In conclusion, a few figures on the new instrument will be worth mentioning
ratio The maximum width of film which can be used in the unit is 30 cm and the
to a maximum image size to be rectified 24 X 24 cm”. The maximum inclination of
s by the copyboard in two components is 14% each way. The range of magnification is
; the from 0,5 to 6,4 times. A feature which is essential for the installation of the instru-
ment in rooms of low height deserves special mention: The novel lighting system
'am- permits to reduce the minimum structural height of the instrument to 2,0 m.
own With this low height, the unit will produce enlargements up to twice the original
ocal size. When adjusted for enlargements up to 6,4 times the original size, the instru-
dard ment has a maximum elevation of 2,7 m.
tain It is believed that with this new model a rectifier has been developed which
rms incorporates a number of essential improvements. It is hoped that it will make
for new friends and contribute to popularize the application of rectification.
the ra
( Cf. Topographic Manual, Spec. Publ. No. 249, US-Department of Commerce, Part. II Photo-
e 8, grammetry p. 189 ff., Washington 1949.
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17
