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height increases. Where the cabin is pressurized the change is least. 
Largest change occur when the lens is exposed to the atmosphere but heated 
to maintain a constant temperature of 7°C. 
The data reported in Meier's invited paper emphasizes the changes that can 
occur in flight calibration of cameras due to different camera enyironments. 
It points up the need for monitoring all flight conditions so that errors 
can be corrected. It also suggests, that we treat our laboratory values as 
basic controlled data with the camera geometry and image quality varying 
as a function of known, preferably measured, environmental conditions 
(author's analysis). 
William P. Tayman is presently directing the activities of the Geological 
Survey Camera Calibration and Optical Testing Facility. He has been engaged 
in the calibration of aerial cameras for over 25 years, formerly at the 
National Bureau of Standards. He has evaluated new aerial lenses, prepared 
specifications and technical data, written a number of papers on photo- ] 
grammetric lenses, and contributed to the Third Edition of the Manual (0 
of Photogrammetry. He received his formal education at George Washington 
University, and the Department of Commerce, N.B.S. Graduate School. He has 
served as American Society of Photogrammetry liaison to the American 
National Standards Institute, Committee PHT, since 1960 and is now serving 
as the U.S. Correspondent for Commission I, ISP. He has been active on 
ASP Image Quality Committees. 
  
Tayman is now involved in a project to measure the resolution of aerial 
negatives, undertaken jointly by the National Ocean Survey and the U.S. 
Geological Survey. The primary objective is to determine whether aerial 
resolution can be improved by exposing slow-speed, fine-grain film in a 
Camera equipped with image motion compensation. A secondary objective is 
to test the alternative approach of exposing normal-speed film at maximum 
aperture, with a shorter exposure time minimizing the effect of image motion. 
During the past year an investigation has been under way to determine 
whether new methods of camera calibration will provide the desired degree 
of accuracy for analytical projects. One example is the accuracy of film 
dispositive distortion; when dispositives are made with new vacuum stable (9 
platens distortion is in the order of * 2 microns. In earlier work dealing 
with diapositive radial distortion, appreciable differences in measured 
values were obtained due to vacuum induced warpage of the film platen. 
Measurements made on new platens indicate a much higher degree of flatness, 
both with and without vacuum applied. It is accordingly certain that asym- 
metries arising from this condition have been very materially reduced. 
Lorin C. Peck is a member of WG-3 supervising some of the simulated enyiron- 
mental tests which are planned to be conducted at Hill Air Force Base, Utah, 
U.S.A. . Mr Peck is working in the Production Engineering Branch of Mainten- 
ance. His work brings him in close contact with production problems of the 
aerial photography and photogrammetry sensor systems which support Air Force 
reconnaissance and mapping. Methods of analysis of image properties, design 
of image tests as quality and reliability criteria, writing specification 
and technical orders for photographic systems are his present responsibilities. 
16