A 
In the application of radial triangulation with rectification of the photographs, and in block triangula- 
tion, itis an advantage to be able to measure the deviations of the camera axes from the vertical from 
data available during photo flight. To achieve this a Horizon Camera (Fig. 5) can be mounted in a 
special support combined with the RC9 Cameral. The horizon can normally not be photographed with 
equal advantage in all directions, and the horizon camera is therefore equipped to photograph four 
horizon sectors at right angles to one another (Fig. 6). Either panchromatic or infrared perforated 
cine film is used. 
  
and their image on cine film. 
  
E | Fig.6 Arrangement of the horizon pictures 
  
  
  
  
  
  
  
  
te 
  
  
  
  
  
  
  
| Kor rit + Al + ++ + AX; L| 
poonpnpnooaoaooucdnu 
À ; Fig.7 The Wild RST2 Statoscope data is 
N : ; recorded for each exposure on the 
i : . original film in the aerial camera. 
E 
E 
* + + 3 * + + 
+ + + * * + H 
  
  
  
  
  
  
  
  
  
  
  
In addition to this, statoscope data (Fig. 7) can also be recorded on the original film in the taking 
camera, giving the relative height differences of the exposure stations of the strip. Previously stato- 
scopes have been kept at a constant temperature by ice-water, which was both inconvenient and in- 
adequate. The capillary liquid for indicating airpressure differences was also inconvenient. A new 
statoscope (Fig. 8) was therefore developed, which operates almost automatically. The enclosed air 
volume is kept constant at approximately + 60°C by means of a special heating system with many- 
layered temperature insulation. 
The RC9 also has the necessary contacts for connection of further auxiliary instruments such as the 
Profile Recorder, the Radioaltimeter or the Doppler Navigator. 
By these means, the conditions necessary for economical photography of large areas have been 
satisfied.