Scirtryck ur Svensk Lantmatcritidskrift nr 3 1964
453
The Stability of the Film. Measurements in
Diapositives Made from the Same Negative
Anders AIore n, Division of Photogrammetry
R. Inst, of Technology, Stockholm
In order to investigate the stability of the film and its variation from
time to time after the development, the following investigation was
made.
One photograph of the Ôland test area was taken by each of the
three cameras Ag 38, Ag 41 and Ag 196, Two contact diapositives
were made June 29, 1963 and then from the same negatives another set
of three diapositives at an interval of about one month. The differen
ces between the diapositives were measured in a sterecomparator, Wild
Stk 824, in twentyfive regularly located points. Thus each diapositive
was compared to one of the diapositives made June 29 which was con
sidered as given, i. e. used as reference. The adjustment was made
according to the metod of least squares, using the following parameters:
microns