, 
—>[r mm 
, 
eee mm 
ves in the 
nd earth’s 
‘ements. 
microns. 
the radii. 
s. There- 
consider- 
ich were 
n adjust- 
n the re- 
sic diffe- 
rential formulae, written as correction equations. Corrections were also 
applied with respect to the radial distortion. The residual image coor- 
dinate errors are demonstrated in Table 19. 
Table 19. Residual image errors after adjustment with the aid of combination 
r' — 100.6 mm. 
  
  
  
  
Point Image no. 1 Image no. 2 
— we | = TV. nri 
microns 
22 —13 +9 17 —18 
24 +8 | — 8 +15 — 5 
26 7 | +16 +10 —10 
39 0 | —16 — 6 — 4 
34 +8 — +12 +5 
35 9 | +3 — 1 — 7 
42 +H | +12 cud + 4 
43 +7 —12 — 7 — 5 
45 = — 8 10 -18 
46 "T — € 79 4 
53 +6 — 1 — 8 — 7 
54 +11 — 8 ds + A 
55 A —11 — 2 — 8 
62 + 8 +30 —19 +8 
64 — 7 —10 —18 — 5 
66 —12 — 8 — 9 — 4 
  
  
The mean square values of the residual coordinate errors are 10 and 
9 microns for the photographs number 1 and 2 respectively. In Dia- 
grams 28 and 29 the residual coordinate errors are graphically de- 
monstrated for the two photographs. 
It should be noted that the image coordinates were measured in the 
autograph A7 no. 310. Consequently the errors of the autograph are 
also included in the demonstrated figures. 
The autograph itself was tested with the aid of a high precision 
glass grid. The standard error of unit weight of the grid coordinate 
measurements was now found to be about 5 microns. The average of 
the corresponding error from the combination instrument-photographs 
was found to be 9 microns, Consequently the standard error of unit 
weight of the image coordinate measurements can be found as the 
square root of the expression 92-52 or about 7 microns. This figure 
is free from the influence of radial distortion and affine deformation 
of the photographs. 
58