524 SCIENCE PROGRESS 



Street, R. O., The Tidal Motion in the Irish Sea, its Currents and its Energy, 



Proc. Roy. Soc, 98A, 192 1, 329-44. 

 DooDsoN, A., The Harmonic Development of the Tide-generating Potential, 



ibid., lOOA, 1921, 305-29. 

 Street, R. O., The Dissipation of Energy in Permanent Ocean Currents with 



some Relations between Salinites, Temperature, and Currents, ibid., 99 A, 



192 1, 39-46. 

 Milne, E. A., The Tensor Form of the Equations of Viscous Motion, Proc. 



Camb. P.S., xx, 1921, 344-6. 

 Harrison, W. J., On the Stability of the Steady Motion of a Viscous Liquid 



contained between two Rotating Coaxal Circular Cylinders, Trans. Camb. 



P.S., xxii, 1920, 425-37. See also Proc. Camb. P.S., xx, 1921, 455-9, 



for some corrections. 

 Harrison, W. J., The Pressure in a Viscous Liquid moving through a Channel 



with Diverging Boundaries, ibid., xix, 1920, 307-12. 

 Hemmy, a. S., The Flow of Viscous Liquids through slightly Conical Tubes, 



Proc. Phys. Soc. Lond., xxxiv, 1921, 22-6. 

 Walker, W. J., Fluid Discharge as affected by Resistance to Flow, Phil. 



Mag. (vi), 41, 1921, 286-8 ; also ibid., 42, 1921, 138-9. 

 Havelock, T. H., On the Decay of Oscillation of a Solid Body in a Viscous 



Fluid, ibid., 628-34. 

 Stanton, T. E., Marshall, D., and Bryant, C. N., On the Conditions at 



the Boundary of a Fluid in Turbulent Motion, Proc. Roy. Soc, 97 A, 1920, 



413-34, where it is shown experimentally that in turbulent motion there 



exists at the boundary a layer of fluid of finite thickness, which is in 



laminar motion, and which has zero velocity at the boundary. 

 Jeffreys, H., On Turbulence in the Ocean, Phil. Mag. (vi), 39, 1920, 578-86. 

 Carmichel, C, Sur les regime hydrauliques, Comptes Rendus, 173, 1921, 



630-2, 1061-3 ; see also D. Eydoux, ibid., 701-3. 

 Mesnager, M., Sur les applications du tube de Pitot, ibid., 171, 1920, 689- 



90 ; see also Y. Delage, ibid., 646-51 ; M. Leaubeuf, ibid., 1109-11. 

 De Sparre, M., Sur le rendement maximum des turbines, ibid., 172, 1921, 



501-4, 896-9, 156X-4 ; 173, 1921, 1045-9. 

 Miyagi, O., Researches on the Theory of the Action of Centrifugal Pump Im- 

 pellers, Tech. Rep. Tohoku, i., 1920, i-ioo. 



In the problem of resisted motion a very important piece of 

 work is that contained in a paper by R. H. Fowler, E. G. Gallop, 

 C. N. H. Lock, and H. W. Richmond, entitled, " The Aero- 

 dynamics of a spinning Shell," Phil. Trans., 221A, 1920, 295- 

 387, Proc. Roy. Soc, 98A, 1920, 199-205. This is an exhaustive 

 experimental and mathematical investigation of practical as 

 well as of theoretical importance, and the path of a spinning 

 shell moving in air is calculated and plotted under various con- 

 ditions. The resisted motion problem as applied to pilot 

 balloons is discussed by C. A. Brazier, Comptes Rendus, 173, 

 192 1, 644-6, 756-8, M. Alayrac examines the motion of the 

 centre of gravity of a body symmetrical about a vertical plane 

 and moving in a resisting medium, ibid., 172, 1921, 1089-92. 

 The equilibrium of particles in an ascending current is discussed 

 by R. Feret, ibid., 575-8 ; while A. V^ronnet writes on the 

 variation of a conic path in a resisting medium, ibid., 267-9. 

 The application to pendulum motion is the topic of a paper by 



