Smithsonian Report, 1938. — Panning 



Plate 7 



1. The dam in Oruetz on the Havel seen from below; on the right side on the picture the needleweir and on 

 the left side the rampart. Left from it the sloping wall and on its upper edge the trap. (Photographs 

 by Dr. Roehler.) 



2. Trap projects by the dam in Gruetz on the Havel left wall with trench traps and climbing mitten crabs. 



(Photographs by Dr. Roehler.) 



