[shaw-henry] simple PERIODIC CURVES 151 



Summary 



The arbitrary character and the undesirabihty of the customary 

 methods of analysing estuary tidal curves are pointed out, and a 

 "projection" method is suggested. The elementary theory and the 

 procedure of this method are outlined, also a description is given of a 

 simple apparatus for such analysis. It appears probable from a series 

 of projection experiments, that any tidal graph for one tide may very 

 approximately be obtained by projection from one wave length of a 

 pure sinusoid, the transformation involving three paramètres; also 

 that the tidal graphs for any place on an estuary may, in some cases, 

 be obtained as a whole by the projection of the tidal graphs at some 

 other place on that estuary, only two paramètres being required. 

 The importance of this relationship, and its possible application to 

 tidal prediction is emphasized. The association of the paramètres 

 which are needed in the projection method, with the physical tidal 

 factors, is also discussed. 



McGill University. 



