INTERNATIONAL SOCIETY OF PHOTOGRAMMETRY 
COMMISSION IV 
Milan, October 27, 1951 
Dear Colleague, 
We have pleasure in transmitting copies of the questionary of the 
Commission IV of the 7th International Congress of Photogrammetry, 
with the request to distribute it to the Members of this National Society 
and to all State and private organisms who could furnish an answer to 
the different questions in it contained. 
The answers you will gather should be sent to us until January 
31st 1952 in order to allow us to write in time the report to be examined 
and discussed at the Washington’s Congress. 
Thanking you for your collaboration we are, dear Colleague, 
Yours faithfully, 
The Secretary The President 
L. OTTOLENGHI G. CASSINIS 
Send the correspondence to: Prof. Gino Cassinis, Politecnico, Piazza 
L. da Vinci, 32. Milan (Italy). 
(QUESTIONARY TO BE SUBMITTED TO THE COMMISSION IV or THE 7TH 
INTERNATIONAL CONGRESS OF PHOTOGRAMMETRY - 1952 = WASHINGTON. 
A) Maps ON SCALE 1:25 000 AND MINOR SCALES. 
a) Most of them are obtained by redressing of single photogramms 
or restitution of couples of stereotype plates. 
b) On which scale are executed the redressing or the restitution. 
Eventual use of photomechanical instruments for the transformation 
of the scale.