Abstract
Determination of the direction of the ice movement is a factor of fundamental importance in the theoretical discussion of glaciations. It may, however, also be of practical value in one-prospecting for ascertaining the places of origin of the blocks of ore transported by the ice. From the point of view of photographic interpretation it would be very practical to divide the glacial forms according to size and possibility of identification. Since the absolute size may vary considerably in one and the same form, and moreover since aerial photographs are on entirely different scales, it is not possible to make an exact division. A tentative division into three orders of size has been made, and the forms of the second order and their use as direction indicators have chiefly been dealt with in this paper. Aerial photos from Scandinavia have formed the basic material for these studies.
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