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important technical improvement in compilation procedure was 
the change to negative assembly on transparent plastic. From 
these assembled negatives contact vinyl base prints were obtained 
and used as the final compilation manuscripts. The last 30 per 
cent of the maps of Newfoundland were assembled in this manner. 
After checking, final inspection, and editing, the map manu- 
scripts were forwarded to the Map Compilation and Reproduction 
Division of the Surveys and Mapping Branch for fair drawing or 
scribing and other reproduction processes leading to map publi- 
cation. 
It is difficult to compare map progress figures for one 
area with those for another area, particularly where there is 
wide variation in the culture, relief information, and other de- 
tail that are transferred to the map manuscript. However, the 
average figures for the Newfoundland project may be of some 
interest. For all stages of photogrammetry and compilation the 
production was 3.4 square miles per man day, of which time 
approximately 25 per cent was required to establish photogram- 
metric control, 50 per cent to plot map detail, and the remain- 
ing 25 per cent to assemble the information and check the plotted 
detail. 
Since this work started, seven years ago, equipment and 
techniques have undergone very considerable changes. Were the 
Topographical Survey called upon to do this mapping today, it is 
probable that for areas not already covered at photo scales 
suitable for multiplex, higher flying would be requested and 
equipment with higher precision than multiplex used. Such 
smaller scale photography would not appreciably change the 
amount of field work, much of the time saved in control opera- 
tions being used on additional field interpretation and identifica- 
tions. Compilation rates, however, might be improved by 50 
per cent, and advantage could be taken of direct scale-drawing 
techniques by equipping plotters with pantographs and scribing 
at the 1:50, 000 scale, 
From the 31st of March, 1949, to the end of December 
1955, Topographical Survey directed an average of approximately 
10 per cent of its field surveys and 20 per cent of its map com- 
pilation towards mapping the Island of Newfoundland. During 
this time, the Survey succeeded in compiling 159 of the 167