Mr. A. J. Robertson on the Negative Wave of Tramlation. 193 

 a 



and 



/ « , . /a — Ik y 



and for the velocityj 



v = —Y^' V{ct-k).cj= ^'^.[a- 



2k).g. 



In the following table the columns A, B and E, are the same 

 as those of Table XI. given by IMr. Scott Russell in his second 

 report, where 



Column A is the depth of the fluid reckoned in inches from 

 the lowest part of the wave. 

 B the depth of the wave reckoned below the surface 



of repose. 

 E the velocity obsen'ed ^ 



/a — k I ^" ^^^^ P^^" 



F by the formula a/- (« — 3% r second. 



G the difference between E and F J 



Phil May. S. 4. Vol. 1. No. 3. Marck 1851. 







