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OPENING OF THE EXPOSITION 
by 
O. S. Reading, President. 
We have heard this morning from the National Society Presidents and 
Delegates much about the devopment of photogrammetry since The Hague 
Congress that is very inspiring. I am sure we are all eager to examine these 
developments. We are fortunate indeed that practically every leading manu 
facturer of photogrammetric equipment this side of the Iron Curtain has 
brought his best products here to Washington to show them to us. Engineers 
are available to answer our questions. It has been well said that “Photogram 
metry marches step by step with the makers of its equipment.” Naturally then, 
we are all eager to examine and learn about their latest improvements and 
appreciate deeply the efforts they have made, the rather high expenses they 
have undergone, to show them to us. 
At this Congress exhibits of great interest by three of the Technical Com 
missions have also been arranged. 
Commission 4 has furnished a comparative cartography exhibit in which 
outstanding maps of six different scale groups are arranged side by side for 
ready comparison and study of the latest ideas in cartography. The advantages 
in completeness and accuracy of detail available in maps made through photo 
grammetry are also strikingly apparent in this exhibit. Another special feature 
exhibit of Commission 4 is the remarkably efficient process for keeping infor 
mation on maps currently revised, the PVA process of the Ordnance Survey of 
Great Britain. We are much idebted to General Brown, the Director General of 
the Ordnance Survey, for supplying this exhibit in response to an urgent last 
minute request of the Comittee. 
Commission 5 has supplied most interesting exhibits of many special appli 
cations of photogrammetry that have much to contribute to our economic 
efficiency. The possibilities of the bench camera and relief mosaics of the 
United States Army Map Service, the inventories of stock piles and forests by 
photogrammetric techniques are well worth our attention. 
The new Commission 7, Photo Interpretation, also has a fine exhibit. I am 
sure we are just beginning to realize the possibilities of photo interpretation 
for accelerating inventories of natural resources, for improving with a mini 
mum of field work our knowledge of practically every natural resource. I have 
heard estimates that 95 percent of military intelligence is obtained through 
interpretation of photographs. 
Photo interpretation cannot attain its full possibilities unless the inter 
preters are well grounded in photogrammetry. Nor can photogrammetry, on 
the other hand, attain its full usefulness without the best possible photo inter 
pretation. The remarkable developments in photo interpretation during the 
past decade to be presented at this Congress and Exposition form a most wel 
come addition to the usefulness of photogrammetry. The possibilities of photo 
interpretation are just being explored. The new Commission 7 will have much 
to offer to future Congresses, as well as to this one.