64 
For the longitudinal strips approximately 25 models per strip are obtained. Therefore, 
approximately 280 models (principal strips plus longitudinal strips) had to be trian 
gulated to perform the block triangulation. 
w 
T-l 
A A 
A A 
A A A 
FA A 
A A 
A 
AA 
A 
A 
A 
A 
A 
A A A| 
A 
A 
A A A 
A 
Approx, 8o km 
s 
T-3 
A A 
A 
A 
A A' 
A A 
Ê a a 
A AA 
a a ^ 
approx. 
80 km 
Figure 1. - Scheme of Block Triangulation «Massif Central» 
To check the accuracy attained by the block triangulation, 299 consecutive test 
points were given (Nos. 1, 2, 3, ... 299). For the adjustment of the block triangulation 
a certain number of these test points (given ground control points), as indicated in 
Fig. 1, were used. The location of the test points is shown in Capter YI. 
2. Material and Equipment. 
Wild RC7 photography with Statoscope were used. Instrumental work was 
performed at the Wild Autograph A7, of the Department of Geodetic Science, using 
the aer ole veiling method. 
3. Personnel. 
The instrumental work was done by Mr. F. J. Montero, Assistant Instructor. 
Mr. R. B. Forrest, Research Associate, and Mr. Ron K. H. Adler, Research 
Assistant performed the strip adjustments and the block adjustment. Mr. Montero