202 



APPENDIX. 



TABLE II. EXTRACT. EXPERIMENTS MADE UPON THE MONKLAND CANAL. 



Dimensions of the Section of the Monkland Canal. 



From the observations made upon the spot by Mr. Macneill we select the following 

 interesting and important conclusions. 



" That in the wide and deep canal the resistance was observed to increase with the velocity, 

 " but not in any uniform ratio. 



" That in the shallow and narrow canal the resistance had a limit at a certain velocity, and 

 " under certain circumstances even decreased with the increase of velocity. 



" That there existed a relation between the resistance and the inclination of the keel ; the 

 " resistance diminishing and increasing in some ratio or other, as the angle it made with an 

 " horizontal line diminished or increased. 



" That the boat absolutely rises during its motion. This fact was most satisfactorily de- 

 a monstrated by the apparatus designed for the purpose. In some of the experiments, the 

 " mean of the several rises, indicated by the four slips, was about 4 inches, the bow being, in 

 " every case, more elevated than the middle and stern." 



The subject of this last observation has excited considerable interest amongst scientific 

 men, but it does not appear to have met with a satisfactory explanation. It has been par- 

 ticularly noticed by Mr. Russell of Edinburgh, the same gentleman we alluded to at page 182, 

 who has, in furtherance of the objects of the British Association for the Advancement of Science, 

 devoted much time and labour to the experimental investigation of the progression and nature 

 of the waves produced on canals and rivers. Mr. Russell's experiments have proved very 

 successful, and in his reports he has developed many valuable and interesting facts relative to 

 the phenomena of waves, which promise to have an important bearing on the prosecution of 

 future hydrodynamical researches ; but, in our view, he has, in some instances, jumped rather 

 hastily to his general conclusions, and in his endeavours to investigate, or rather to induce, 

 the laws of dynamical and statical emersions, we conceive he has proceeded on sup- 



