?00.D0 cubic HT-LiTS of sand is daprsi '::"1 iri ;'_' h-T-bof eRbranca, '- 

 wast assuRsa hvrs th-^-t aovs sand cores Irorn th: north/ 



''^r, Revalis cjoneludGS his tbjsis Ti-ith tha followias; statenant: 



"V.hon de yG- rmining the movement of sand on our coci.sts by Prof- 

 essor Vfinch-Petersen' s formula j we found at all locations a good 

 correspoirience I'dth the conditions of nature^ as bhi;se have been 

 observed or found through measurements. The vector-polygons con- 

 structed according tjo the formula ^ and the projection of these poly- 

 :^on& on the coast line^ eive a clear picture of the directions of 

 the material movement > and through this a criterion for the orienta- 

 tion of preventive p:t»oJ3ct3 for harbors on sandy coasts.*' 



From this we can see that Professor Tfunch-Fetersen's explanation of 

 the problem, of material drift has met with great interest and under- 

 standing abroad, and that th$ essential parts are accepted „ However, 

 it cannot bs denied that the formula is too little varied and is still 

 in fact^ under develop^ment , but it is, in a way, the duty of tech- 

 nicians to continue the study of this problem. It is to be hoped 

 that it isi.ll be possible to improve the form.nla so that the material 

 drift can be determined not only qualitatively but also quantitative- 



In conclusion I will mention that at the hydrological conference 

 in Berlin which ended last Sunday a resolution was agreed upon which 

 calls on the governTents of all the Baltic states to investigate the 

 question of sand drift. The governments are asked to make maps of 

 the deposits on the ocean bottom from the coast line out to great 

 depths J then %o measure the quantities of the drifting sand and try 

 to find formulas tjhat agree with vihat they have found,,. 



