| Abstract: | Following a successful meeting in 1971, the Photogrammetric Society held a second symposium at the University of Birmingham on 31st March and 1 st April, 1973. Four papers were delivered. The first considered the problems of the instrument operator and the contribution which he was able to make to the development of techniques and instrumentation. The second paper examined the status of the optical transfer function in lens calibration. Participants were able to look back and appreciate the early use of air survey methods, particularly in India, during the third paper and then turn to consider the present position of photogrammetry during the final paper. |
