220 
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(Zeiss, Jena: G. Fisher). 
von Gruber, Otto (1942): Photogrammetry, Collected Lectures and Essays 
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Airplane Mapping Cameras (J. of Research of the US Natl Bureau of 
Standards, Vol. 27). 
Washer, Francis E. (1957a): Prism Effect, Camera Tipping and Tangential 
Distortion (PE 23/3). 
Washer, Francis E. (1957b): Calibration of Airplane Cameras (PE 23/5). 
Woltring, H.J. (1974): New Possibilities for Human Motion Studies by 
Real-time Light Spot Position Measurement (Biotelemetry 1). 
Wong, Kam W. and Elphingstone, G. (1972): Aerotriangulation by SAPGO (PE 
38/8). 
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Statoscope in Aerial Triangulation (ISP Archives 15/5, Com. Ill, 
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