duced in the plotting instrument and the relative orientation is performed by means 
of both ¢’s. Optical-mechanical relative orientation is used. 
2. — The first phase of the program covers the triangulation of the three trans- 
verse strips or principal strips. The adjustment of these strips yields the ground co- 
ordinates and elevations of the transfer points in the principal strips. These adjusted 
transfer points serve as basis for the adjustment of all longitudinal strips. 
3. — The second phase of the program covers the triangulation and adjustment 
of all longitudinal or filling strips. 
4. — All strips are adjusted according to adjustment formulas of second order. 
5. — À special block adjustment is carried out according to the Brandenber- 
ger-Zeller method. 
6. — The residual errors in the test points are determined. After that standard 
residual errors for the individual strips are computed. Also the standard residual errors 
after block adjustment are determined. 
Furthermore, he assures that despite of the short time at his own disposal he 
hopes to perform the block triangulation within the fixed time. 
The preparatory work has been performed within July 5th, as determination of 
the overlap and sidelap; as choice of control points for the adjustment of the chief 
strips; as choice of transfer points; as choice and recording of statoscope data, etc. 
Measurements on the Wild Autograph A 7 have already been started. 
Canadian Centre. — Dr. Schut has sent us the following detailed report on the mea- 
surement and computation proceedings which, at present are at a very improved stage. 
«For the participation in this test the Wild R.C. 7 photographs with principal 
distance 100 mm, size 140 x 140 mm and scale 1: 80.000 were chosen. The eight 
East-West strips were used, and also four photographs of one North-South strip that 
cover the gap at the Eastern end of strip 4 of the East-West strips. 
The prints and the first 120 diapositives were received on March 10, 1960. The 
remaining diapositives were received in April 1960. Owing to the short time left be- 
fore the Congress, the participation in the test consists in the adjustment of plane 
coordinates only. 
1. — Measurements 
The photographs have been measured on the Zeiss Jena 1818 Stereocomparator. 
This instrument can accomodate photographs of the size 180 x 180 mm for measuring 
single models with the overlap inside. For strip triangulation, where measurements 
range over the whole size of each photograph, the size 140 x 140 mm can be accom- 
modated, but only if between measuring consecutive models the left plate holder is 
shifted. This shift causes a corresponding change in the x-coordinates of points mea- 
sured on the left photograph. Coordinates of points on the left photograph are measu- 
red and parallaxes of points on the right photograph. Coordinates and parallaxes 
are read on drums. The drums for reading of coordinates have a smallest interval of 
0,02 mm, those for reading x- and y-parallaxes have a smallest interval of 0,01 mm 
and 0,005 mm respectively. 
The three visible fiducial marks in each photograph have been measured before 
measuring the model points and again, as a check on errors, after completing the mea- 
32 
  
  
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