130 Prof. W. B. Morton and Miss Harvey: Application of 



than it is when placed in position (1), and with the oscillating 

 strip the heat-loss is increased at low and very high velocities. 

 It is evident, then, that as a cooling apparatus a stream-line 

 tube is in every respect more efficient than a circular one. 



The above experiments were carried out in the Physical 

 Laboratory of the University College of North Wales, and 

 my best thanks are due to Professor E. Taylor Jones for 

 placing the necessary apparatus at my disposal, and to 

 Mr. W. E. Williams, B.Sc, A.F.Ae.S., 'for suggesting the 

 subject and for giving most valuable help and advice. 



XVIII. An application of Nomograpliy to a case of Discon- 

 tinuous Motion of a Liquid. ByW. B. Morton, M.A., and 

 Eleanor J. Harvey, M.A., Queen's University, Belfast*. 



HPHE problem of the impact, in two dimensions, of a jet of 

 X friction] ess liquid on a plane strip, when both jet and 

 strip are of finite width, can be solved by the method of 

 conformal representation. The solution was given by Prof. 

 Lovef. The equations which embody the result of the 

 analysis are too complicated to admit of arithmetical calcu- 

 lation of special cases. It is the purpose of this note to point 

 out how numerical results can be obtained by means of the 

 graphical methods developed by M. d'Ocagne. 



Fig.l. 



Taking the width of the undisturbed stream before 

 incidence as unity (fig. 1), the data of the question are the 



* Communicated by the Authors. 



f Proc. Camb. Phil. Soc. vii. p. 175 (1891). 



