Fig. 6 
  
working course. This is obtained by an automatic interrupter with variable inter- 
vals (Fig. 6). This is necessary, since the courses of the lamps belonging together 
must be established beyond a doubt within a range where different movements are 
continually crossing. 
Furthermore the first experiments have shown that it is advisable to take only 
om 3 to 4 repetitions of a work- 
dk ing course on one pair of 
photographs, so that in a 
series of 24 repetitions e.g. 
for the first four and then 
for nre. 11 to 14 and for 
nrs. 21 to 24 one pair of 
photographs is used for 
NN each. Thereby we obtain 
v also a better mean value of 
the movements and a more 
reliable picture of the strew- 
ing. The photographs were 
N taken in a feebly darkened 
^ e room, the shutter of the 
J stereo-camera remaining 
| open while taking 3 to 4 
repetitions each of a work- 
ing course and the light 
signs are altered for every 
new working course by auto- 
À matic connecting. Fig. 3 
shows one of the two photo- 
graphs obtained by this 
method and which, in stere- 
p^ oscopical observation per- 
CN mits of a reliable identifi- 
cation of the various work- 
ing movements which is 
quite impossible with the 
usual light points’ process. 
€ 
Umriss der Kopffigur 
Aufriss 
Umriss der Schulterfigur 
  
  
2 
= 
Grundriss 
  
o = Zeitmarken 
The stereoscopic obser- 
vatior offers, furthermore, 
some very considerable ad- 
vantages as against mono- 
cular observation, since only 
in the former also the diffe- 
rences of depth may be 
observed. 
  
  
  
Fig. 7 
The plotting was executed at the Wild-Autograph A5 in the scale of 1:2. 
The plotting of the courses of light visible in Fig. 3 is shown in Fig. 7. This illu- 
stration presents a projection in the vertical plan and a ground plan view of the