ON WAVES. 



329 



Table III. 



Determination of the Velocity of the Wave of the First Order, from observation. 

 (See Seventh Report of the British Association, and Researches on Hy- 

 drodynamics in the Philosophical Transactions of the Royal Society 

 of Edinburgh, 1S36.) 



The form of the channels was rectangular. 



The breadth of the channels varied from V2. inches to 12 feet. 



Column A gives the depth of the channel in inches reckoned from the top 

 of the wave. 



Column B gives the height of the wave above the surface of the fluid in 

 repose. 



Column C is the velocity of the wave in feet per second, from observation. 



Colunm D is the velocity of the wave calculated by formula B. 



Column E is the difference between columns D and C. 



It appeared to me at one time matter of doubt, whether waves very low in 

 height were not somewhat slower than the velocity of the formula, and those 

 of a large size somewhat more rapid. To determine this point, Tables IV. 

 and V. were prepared, the former consisting of larger waves, the latter of 

 smaller. It can scarcely be said that these tables, M'hich are arranged exactly 

 as the previous one, establish any distinction in this respect. 



