130 SIXTH REPORT — 1836. 



cess, would be a laborious task ; but shows by reference to the excellent 

 condition of the science of navigation, that by great attention in col- 

 lecting and classifying facts, the practice of naval architecture might be 

 raised to a corresponding degree of perfection. 



On certain points in the Theory of Naval Architecture. 

 By Mr. Henwood. 



On the Tides. By the Rev. W. Whewell, F.R.S. 



In this communication Mr. Wliewell explained the state of knowledge 

 concerning the tide, to which recent investigations had conducted ; 

 pointed out the importance of a continuous tide register in furnishing 

 data for the improvement of this imnortant branch of science ; and ex- 

 hibited a model of a tide machine now in the course of erection under 

 Mr. Bunt's direction. 



Dr. Lardner explained his views of the most advantageous modes 

 of forming a steam communication with the East Indies and North 

 America*. 



On the Application of our Knowledge of the PhcEnomena of Waves to the 

 Improvement of the Navigation of Shallow Rivers . By J. S. Rubsell. 



John Robison, Esq., suggested, and illustrated by a diagram, a 

 method of measuring the interval and the velocity of waves at sea, by 

 two ships kept parallel to and equidistant from each other, and counting 

 the crests of waves between them. 



On certain points connected with the Theory of Locomotion. By 

 Professor Moseley, 



On the Performance of Steam-Engines in Cornwall. By John S. Enys. 



The object of the paper was to point out that within the last few 

 months the work done (or the duty) per imperial bushel of Welsh coal, 

 weighing on an average ninety-four lbs. had been more than doubled 

 as compared with similar engines, by two engines employed in stamping 

 ore, erected by Mr. James Sims ; and that, making allowance for the 

 difference of lifting stamp heads (or actual weight) with an uniform 

 resistance, and lifting a weight of water, calculated from the size of the 

 pumps, with a variable resistance exactly suited to a high-pressure 

 expansion engine, a duty of fifty million lbs. raised one foot high per 



* See on this subject the Edinburgh Pcview. 1837. 



