24 
A Wild RC10 camera with super-wide angle lens cone has been purchased 
and will be used to improve rates of output and reduce costs on the provision of 
metric contrours for the whole country. A new camera calibration laboratory 
has recently been completed which uses equipment designed within the 
department based on a converted Cook Troughton and Simms geodetic 
theodolite. 
The department carries out a continuous evaluation of new drawing materials 
as they become available. The contours for the 1:10 000 resurvey series 
continue to be directly scribed, though the material now used has a polyester 
base. A direct penning technique has been evolved within the past four years 
period for contouring the derived 1:10 000 maps and this has saved considerable 
time. 
ROYAL AIRCRAFT ESTABLISHMENT 
The investigation into film flatness in air survey cameras has continued 
with a comparative flight between the roller flattening device, previously 
described, (42) fitted to an F49 mk 4 optical unit and a similar optical unit with the 
conventional pressure plate magazine. The flight was made over an area with 
good ground control and the results are being plotted using standard techniques. 
A laboratory prototype roller flattening facility for the F49 mk 4 camera has 
been prepared under contract by the Williamson Manufacturing Co and is 
currently being assessed by the ministry department concerned. 
Development of the RAE Processer for wide airfilm has continued to a 
mark 2 version which is expected to be produced commercially in early 1972. 
A simple continuous printer embodying automatic grading control of a tungsten 
source is being developed for use with this processer. 
A comparison has been made of the overall and differential distortion 
introduced in acetate and polyester film bases as a result of rapid processing at 
high temperatures. Typical differential distortions across a 10 cm length, 
arising from a temperature increase from 35 C to 60 C were found to be 7 
micrometres for acetate film and 2 micrometres for polyester film. Further 
work is proposed on the long-term stability of polyester base films. 
A simple method for projecting contour lines onto the human face, and 
recording them for subsequent measurement has been developed. 
READING UNIVERSITY. Dept,of Geography 
Some postgraduate researches have been concerned with the interpretation 
of air photographs for natural resources, and civil engineering planning. 
ROAD RESEARCH LABORATORY 
Studies are being made to develop a photogrammetric technique suitable for 
road surface measurement in Kenya. 
ROLLS ROYCE 
Work started to study the application of photogrammetry to control of aero 
engine dimensions. 
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