Full text: Reprints of papers (Part 4a)

/ummnated 
e//oobing mark. 
ors With respet i 
mark, which hag, 
Oy obtained vla 
ro| 
ee. 
— sin 50 
  
  
jute a table of t 
The final projets 
  
13 
Cimbal axis in projection centre (auxiliary system). 
y, Gi 
The situation is given in fig. 14, if the cross K is replaced by the excit pupil of the 
diary system. The derivation of a formula for the projection errors dx¢ and öyc gives 
al 
tions (1). d 
pe total projection error is then (the errors in the projection centre are not (n+ 1) 
enlarged into the projection plane in instruments with optical projection, as the 
4 of rays leaving the projection lens are parallel): 
dX = ôxe + Xp i 
dY = dye + ôy, i (8) 
time 
pond] 
Note: Errors in the gimbal axis of the Stereoplanigraph have been determined by 
à Weele [1]. Nowadays, the factory adjusts the eccentricities in both gimbal axes with 
v d. 
mean Square error my; = — 4 u. 
Conclusions: 
Due to the relation between the cross and the illuminated floating mark, it is pos- 
sile to separate in the Stereoplanigraph errors in the gimbal axes in thc auxiliary system 
tom the ones in the mirror. Any error in the mirror-gimbal axis causes a 0z-displacement 
i the cross with respect to the illuminated floating mark, as can be seen from equation 
(ie) (this 0z appears in the observation system, of course, as an x-displacement). Further- 
pie an error e, causes a dy-displacement of the cross. The gimbal axis of the mirror is 
free of errors if careful 
check shows no displa- 
cement of the cross with 
respect to the illumin- 
ated floating mark, 
provided that the illu- 
minated floating mark 
has been centered onto 
the cross in the position 
a=f=0. 
If a 9- or better a 25- 
point measurement re- 
sults in fig. 7, 8 or 9, 
the diagnosis will be er. 
rors e., €, Or e, respec- 
tively of the gimbal 
axis in the projection 
centre. 
  
AES 
| 
   
  
  
d) Santonis 
| [d 
; P | Stereocartografo IV 
/ | , | F 
  
and Stereosimplex. 
A ball and socket joint 
is used above the pro- 
jection centre. The principle is given in 
Projectson bor. | The ball joint is determined by the 
| | points A, C and D. Requirement is that 
| | both the big ball with radius r, — r, as 
i | | well as the small ball (cam) with radius 
Fig. 19 | r, have M as common centre and that 
  
  
  
  
  
  
  
  
  
  
  
  
  
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3 
3 
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