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IX. On the Surface-Tension of Liquids Investigated by the Method of Jet 



Vibration.* 



liy P. O. PEDERSEN. 



Communicated by Lord RAYLEIOH, O.M., Pres.ft.S. 



Received June 11, Read June 27, 1907. 



[PLATES 2-4.] 



CONTENTS. 



Page 



Introduction 342 



Theory of the vibration of a jet about its cylindrical form of equilibrium 344 



Calculation of the coefficient /* (x) 346 



Calculation of the vibration of a jet 347 



Preliminary investigations 



Arrangement for keeping the pressure constant 350 



Determination of the cross-section of a jet 352 



Production of the desired deviation from the cylindrical form of the jet 365 



Determination of the wave-length 367 



Investigations on the influence of the amplitude of vibration 371 



Execution of observations ' 376 



Various remarks 377 



Remarks on the jet photographs 378 



Result* 



Water 379 



Toluol .384 



Aniline 384 



Aqueous solutions of ammonia 384 



Solution of copper sulphate 386 



Diluted sulphuric acid . 386 



Aqueous ethyl alcohol . 386 



Concluding remarks 387 



* Abstr.ii tfil from a response to Det Kongl. Danske Videnskabernes Selskabs (The Royal Danish Scientific 

 Society's) probli-m in Physics for 1905; delivered October 30, 1906; awarded the Society's gold medal. 

 VOL. CCVII. A 4-J1. 20.12.07 



