T———3»r'mm 
nt deter- 
1e image 
— 29 r'mm 
uction of 
about 1 
on high resolution plates. All measurements of the grids were made in 
the high precision comparator SIP Mu 214 B. no. 277 at the Division 
of Mechanical Engineering, The Royal Institute of Technology. 
In Diagram 31 the results of 6 deferminations of the radial distortion 
of a microscope Panphot are demonstrated. In this case a small grid 
was enlarged 60 times and photographed. 
In Diagram 32 a radial distortion curve is demonstrated for the same 
microscope using reduction of a grid in the camera 60 times. 
References: 
1. Hallert, B.: International Comparative Tests. A Suggestion. Int. Archives of 
; Photogrammetry, Vol. XII, Stockholm 1956. 
2. —— Über die Genauigkeit der Luftphotogrammetrie. Transactions of the 
R. Inst. of Technology nr 99, Stockholm 1956, and Int. Archives of 
Photogrammetry, Vol. XII, Stockholm 1956. 
9. —— A New Method for the Determination of the Distortion and the Inner 
Orientation of Cameras and Projectors. Photogrammetria no. 3 1954— 
1955, and Int. Archives of Photogrammetry, Vol. XII, Stockholm 1956. 
4. Lycken, L. E.: Test Measurements of Grids. Svensk Lantmäteritidskrift no. 
2—3 1956, and Int. Archives of Photogrammetry, Vol. XII, Stockholm 
1956. 
Hallert, B.: Determination of the Flatness of a Surface in Comparison with 
a Control Plane. The Photogrammetric Record April 1960. 
6. Oswal, H. L.: Flexure of Photographic Plates under Their own Weight and 
some Modes of Support and Consequent Photogrammetric Errors. The 
Photogrammetric Record, Oct. 1956. 
7. Odquvist, F.: Hallfasthetslara, Stockholm 1948. 
8. Hallert, B.-Ottoson, L.: General Differential Formulae of the Complete 
Projective Relations between Planes. Transactions of the R. Inst. of 
Technology nr 140, Stockholm 1959. ; 
9. Hallert, B.: Determination and Correction of Systematic Errors in the Fun- 
damental Operations of Aerial Triangulation. Photogrammetric Engi- 
neering no. 4, 1957. 
un 
59