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1 stereoautograph Wild A 6 
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1 stereocomparator Zeiss 
1 Odencrants rectifying apparatus 
1 Odencrants-Wild rectifying apparatus 
Stereoprojectors 
Mirror stereoscopes and parallax bars (Wild, Zeiss etc.) 
Various pocket stereoscopes 
Land surveying equipment including 2 theodolites Wild T 2 
1 Wild TO, 2 Zeiss theodolites, measuring tapes, levelling instruments etc. 
A good cooperation with the Geographical Survey Office, the Board 
of Land Survey, the Department of Photography at the General Staff 
of Defense, the Air Force Administration, the Division of Photography 
and the Laboratory of Optics at the Royal Institute of Technology is 
established since long time. 
Research 
The research at the Division of Photogrammetry has mainly been 
devoted to the theory of errors for photogrammetry. The ultimate goal 
is to find theoretically correct and practically applicable methods for 
the determination of the most probable results of the photogrammetric 
measurements and the reliability of same. For this purpose the photo- 
grammetric procedure has been divided into a number of fundamental 
operations. These operations are separately treated for the determina- 
tion of the basic factors that limit the accuracy. This 1s mainly a prob- 
lem of distinguishing between systematic and accidental errors of the 
basic observations. When the systematic errors are determined as care- 
fully as possible, the error propagation of the accidental errors through 
the procedure is studied. The fundamental operations include the re- 
construction of the pencils of rays from photography, the relative and 
the absolute orientation etc. 
The research has also been devoted to the application of photogram- 
metry to various problems, particularly in the non-topographic field. 
The x-ray photogrammetry has been applied to different problems of 
medicine. 
Cameras for non-topographic photogrammetry have been construc- 
ted and are in practical use. 
Instruments for photogrammetric plotting have been constructed 
(mechanical radial triangulation, mirror stereoscope measurements, 
measuring devices for x-ray pictures in dentistry). 
The instruction 
At present, three courses are regularly given each year. 
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