[ 545 



XIII. The Silver Voltameter. 



PART I. By F. E. SMITH, A.R.C.Sc., and T. MATHER, F.R.S. 

 PART II. By F. K. SMITH, A R.C.Sc., and T. M. LOWRY, D.Sc. 



(Communicated by R T. GLAZEBROOK, F.R.S.) 



Received July 22, Read November 21, 1907. 



(From the National Physical Laboratory.) 



[PLATE 9.] 



PRINCIPAL CONTENTS. 



PART I. 



Page 



Introduction 546 



Description of the voltameters 548 



The anodes 649 



The electrolyte 549 



Form of voltameters 649 



Electrical arrangements 652 



Determination of the mass of the deposits 654 



Principal table of results 656 



Discussion of the result* 562 



The Rayleigh form of voltameter 562 



The Richards form of voltameter 563 



The syphon, pot-syphon-bowl, and syphon-pot-bowl forms 565 



The elevated kathode type 566 



Efficiency of the porous pote and syphons 566 



Deposit on platinum and on silver 567 



Influence of pressure 668 



The temperature coefficient 669 



Liquid inclusions in the deposit 570 



Effect of variations in the size of the kathodes 570 



Effect of variations in the size of the anodes 671 



Variation of potential difference between anode and kathode 572 



Variable concentration of electrolyte 672 



Variation of current density 673 



VOL, CCVII. A 425. 4 A J12.08 



