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phototheodolites are used and for measurements a Wild autograph A4 and a 
Zeiss stereocomparator are the most important instruments. Thus archeologie 
and geologic problems have been treated through ordinary plotting. Changes 
in state of roads have been similary studied. 
A comprehensive treatment of the theory of errors of terrestrial photo- 
grammetry has been given by Professor B. Hallert for a research project 
concerning the application of terrestrial photogrammetry to different measuring 
problems within cities. 
literature: 
Pm], H. Hallert: Determination of the accuracy of terrestrial stereophotogrammetric procedures. — 
Photogrammetric Engineering, March 1955. 
Dr. P. 0. Fagerhohn: Close-up photogrammetry with simple cameras. Photogrammetric Engineering 
1953/4. 
H. Instruments and equipment for non-topographic 
applications of photogrammetry constructed and 
used in Sweden 
1) The new stereocamera for medical research. E 1 
2) Zeiss’ stereomicroscope for capillaroscopy has been modified to facilitate 
photogrammetric work. E 1 
3) A table for the X-ray photogrammetric work on liver volume. The important 
feature is that the inner orientation is put under control. A similar device is 
provided for a »wind tunnel» for hypothermic experiments on animals, 
which has been used for the liver volume measurements. E 3 
4) Apparatus for intra-oral radiography. E 3 
5) Apparatus for extra-oral radiography. E 3 
(j) As an aid in the work on capillaroscopy, E 1, a lens sterescope with alternat 
ing shutters has been built. 
7) In many applications glossy steel balls have been used as signals to provide 
high definition. A 2 etc. 
Most of the work in this field is carried out with available photogrammetric 
instruments. 
Ivar Hæggstrôms Boktryckeri AB • Stockholm 1956