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FIRST MEETING HELD ON MONDAY, 12th SEPTEMBER, 1960 
In the Chair: Prof O. W. MINTZER 
Introduction by the President 
This Session is devoted to the study of the 
earth’s surface as such by aerial photographs. 
The work on this over the past four years has 
been headed by Mr Page Truesdell who un- 
fortunately, due to the budgetary problems of 
those employing him, is unable to be with us 
today and this week. Therefore, this Session is 
to be handled by Professor Owen Mintzer who 
has been working more or less along with Mr 
Truesdell and who has himself prepared a paper 
for presentation. Professor Mintzer is professor 
of Geology at the University of Ohio in the 
United States. He has worked in highway en- 
gineering and geological work, using aerial 
photography for some twenty years or so, and is 
well qualified to head this Session, I am sure. 
Without further ado I will hand the Session over 
to Professor Owen Mintzer. 
Introduction by the Chairman, Prof Mintzer 
Prof O. W. MINTZER: I also have some an- 
nouncements to make since I am in the position 
of handling the Session for Mr Truesdell. I 
should do this before I start my paper. In our 
Session to be held on Wednesday afternoon at 
14.20 we shall have an additional discussion of 
any papers or any information which comes 
before you this afternoon. That will be in room 
381 in the Institute of Education. Mr Thorén 
from Sweden will show some slides of ice forma- 
Archives 6 
tion and pattern ground. Also, if there is time, 
I believe we have a movie which has not yet 
been shown. It is on geology and interpretation. 
Mr Thorén’s slides will be of Alaska, Spits- 
bergen and the North East land. 
Prof Mintzer then presents his paper “Using 
Airphotos to Identify Construction Sources of 
Gravel”