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have got to know each other better and to appreciate more each other’s efforts and experience. 
This has led to higher esteem for the work of each participant, better knowledge of the conceptions 
of others, and willingness to test and improve the most interesting solutions, whatever their origin. 
Thus the work of the OEEPE is essentially constructive. The merit for this belongs entirely to 
all the members ot the Steering Committee and the Commissions, who exert constant effort for 
the success of the work. 
Ever since its creation the OEEPE has laid great importance on good collaboration with its 
older sister organisation, the ISP. This collaboration has developed in a concrete way: first 
through the friendly relations between the organs, directors and commissions of the two organisa 
tions: secondly in the use of common organs, that is, Photogrammetria, the official publication of 
the ISP and the Archives. Finally, the OEEPE participates in the congress and exhibition of the 
ISP. The association of the OEEPE with this congress is sufficient evidence of the excellent 
collaboration established between the two organisations. Of course, it could not be otherwise, for 
they both pursue, in different forms, the same purpose: the progress of p ho to gra m me t ry. 
During the proceedings, the following telegram was received from His Majesty 
the King of Sweden: »Please extend to the Congress my hearty thanks and best 
wishes.» Gustaf Adolf 
Au cours des délibérations le télégramme suivant est reçu de Sa Majesté le Roi de Suède: 
»Veuillez exprimer au Congrès mes remerciements est meilleurs souhaits.» 
Gustaf Adolf. 
The President then proposed a cheer for the King. 
Le président propose un vivat pour le Roi. 
The President then rose to address Dr. Ludvig Bertele and present him with 
the Brock Award: 
The President: 
The Brock Award 
Le président prend la parole pour s’adresser au Dr. Ludwig Bertele et lui décerner la 
Médaille Brock. 
The considerable progress of photogrammetry, especially aerial photogram- 
metry, during recent years, can to a large extent be attributed to the develop 
ment of lenses. 
In this respect we should remember the late German physician and optician 
Dr. Robert Richter, whose lenses »Topogon» and »Pleogon» represented con 
siderable steps in this development. 
Here amongst us there is another pioneer in lens construction, Dr. Ludwig 
Bertele. His constructions »Aviotar», »Aviogon», and the new super-wide angle 
lens are important new creations which enlarge both the technical and the 
economic possibilities of photogrammetry. 
The International Society for Photogrammetry is now able to honour pioneer 
work of this kind by the award of a medal. Mr. Virgil Kauffman of Philadel 
phia instituted this medal in memory of the two pioneers of American photo 
grammetry, Arthur and Norman Brock, and it is therefore called the Brock 
Medal. 
This medal is to be awarded by the Council of the ISP »only in recognition 
of an outstanding landmark in the evolution of photogrammetry». 
The Council has decided to award the first Brock Medal, in accordance 
with the regulations for the 1956 Congress to Ludwig Bertele on the grounds 
that he has by means of various lens arrangements enabled photogrammetrical 
objectives, in particular wide-angle objectives, to be constructed, with smaller 
distortion, considerably improved resolving power, better chromatic correction 
and less reduction in illumination strength towards the corners of the pictures. 
He has thereby increased the value of the photogrammetric objective and con 
siderably raised the capabilities and economy of photogrammetry. For these 
reasons the Council of the International Society for Photogrammetry awards the 
Brock Medal to Ludwig Bertele at the VIII International Congress of Photo 
grammetry in Stockholm.