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Contents of PROCEEDINGS, No. A 699. July, 1921. 



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Page 



THE VIBRATIONS OF A SPINNING DISK. By H. Lamb, F.R.S., and R. V. 



Southwell .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 272 



A LIQUID OXYGEN VAPORISER. By E. A, Griffiths 281 



A SIMPLE APPARATUS FOR APPROXIMATE HARMONIC ANALYSIS 



and FOR PERIODICITY MEASUREMENTS. By W. L. Balls, M.A., Sc.D. (Cantab.) .. .. 283 



MULTENIONS AND DIFFERENTIAL INVARIANTS. By A. McAulay, M.A. 292 

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A.k.C.Sc. (Plates 3 and 4) 324 



ON THE VISCOSITY AND MOLECULAR DIMENSIONS OF GASEOUS 



CYANOGEN. By A. O. Ranki.n-e, D.Sc 331 



THE PROPERTIES AND MOLECULAR STRUCTURE OF THIN FILMS 



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