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VIII. Researches in the Theory of the Motion of Fluids. By the Rev. 

 James Challis, late Fellow of Trinity College, Cambridge, 

 and Fellow of the Cambridge Philosophical Society. 



[VieaA March 3, 1834-3 



1. The subjects treated of in this communication are of a miscel- 

 laneous character, referring to several points of the theory of fluid 

 motion, respecting which the author conceived he had something new 

 to advance. In illustration of the principles he has attempted to establish, 

 solutions are given of two problems of considerable interest: — the 

 resistance to the motion of a ball-pendulum ; and, the resistance to the 

 motion of a body partly immersed in water and drawn along at the 

 surface in the horizontal direction. The principal object in the solution 

 of the latter problem is to account for the rising of the body in the 

 vertical direction on increasing the velocity of draught, which in some 

 recent experiments on canal navigation has been observed to take place. 

 In the course of the paper I have had occasion to refer several times 

 to a previous communication* to this Society respecting fluid motion, 

 for the purpose of giving to the views there advanced some corrections 

 and confirmations which have been suggested by more mature considera- 

 tion. For the sake of distinctness the subjects of the present essay 

 are divided into sections. 



• Camb. Phil. Trans. Vol. HI. Part in. 

 Vol. V. Part II. > Z 



