372 MR. P. 0. PEDERSEN ON THE SURFACE-TENSION OF LIQUIDS 



In the following the amplitude of the jet will be denoted by 8, determined by 



or, according to equation (1), 



8 = 100. m " m " 1 ... (2), 



'max ~r mln 



8=100.* . . . -. . . (2'). 



a 



The same notation will be used for the orifices. 



In 1 the necessity of an investigation respecting the influence of the amplitude 

 on the period of vibration has been already emphasized. The only material that is 

 available in this case consists of the measurements made by Lord RAYLEIGH* and 

 recorded in his original paper. For some of these I have calculated the surface-tension 

 according to formula [(2), 1], and arranged Table V. in order of decreasing amplitude. 



TABLE V. 



From the values of T it is evident that the amplitude for the three jets has been 

 too great. How far this is also the case with the jet corresponding to the orifice for 

 which 8 = 9 cannot be determined on the basis of the investigations mentioned. In 

 the measurements of MEYER! and PICCAKD,^ the amplitudes in accordance with the 

 above have been much too great. 



In order to decide this question, I have made a series of measurements with jets of 

 water ; the orifices used for these are recorded in Table VI. 



The results of these experiments are found in Table VII., where the orifices are 

 arranged with decreasing amplitudes. In the table, T indicates the surface-tension 

 calculated upon the supposition that the amplitudes could be considered as extremely 

 small. 



* RAYLKIGH, 'Roy. Soc. Proc.,' 29, p. 71, 1879 ('Papers I,' p. 377). 

 t MEYER, loc. cit. 

 } PICCARD, lf. at. 



