276 Mr. H. F. Morley on Grove's Gas-Battery. 



n. 



c. 



R 



E. 



calc. 



63 



25 



240,000 



6,000 



25 



63 



39 



11,600 



450 



40 



63 



42 



1,600 



67 



41 



8 



203 



10,200 



2,070 



204 



75 



217 



200 



43 



219 



10-5 



201 



10,200 



2,050 



196 



11 



81 



244,500 



19,800 



81 







277 



10,200 



2,800 



224 







91 



234,500 



21,300 



89 



n is the distance between top of plate in hydrogen-tube and 

 surface of liquid in that tube, in millimetres ; n = means 

 that the plate cuts the surface and rises about 1 millim. above 

 it : the plate in the oxygen tube was always at the same dis- 

 tance from the surface and was wholly immersed. C is the 

 final strength of current, usually several hours after introdu- 

 cing resistance, given in deflections of the galvanometer, each 

 of which is about '00000073 weber. R is the resistance in 



OR 



ohms ; and E is .. ( ' 



In the first place, it seems that the increase of current con- 

 sequent on causing the platinum to cut the surface is too 

 slight to oblige us to assume that a new force is thereby 

 brought into action ; in other words, the whole of the current 

 in the gas-battery is due to dissolved gas. 



I tried to express the relation between n, C, and E in a for- 

 mula obtained theoretically. In this I had but little success ; 

 but perhaps I may venture briefly to indicate the results: — 

 Let abscissas represent depth 

 below surface; ordinates quan- 

 tity of hydrogen in solution at 

 any level, supposed uniform. 

 Imagine a tube of uniform bore 



open to air at D and to hy- X IB c 



drogen at A. Suppose B C a uniform platinum rod, or rather 

 an indefinite number of infinitely near equal platinum plates. 

 Consider them to form equal branches of a divided circuit, and 

 suppose the strength of current the same in each. 



Suppose the number of molecules of hydrogen ejected from 

 any layer in a given time to be proportional to the total num- 

 ber in that layer. Let u x be the quantity of hydrogen in a 

 layer at distance x from A ; then, when equilibrium is attained, 

 AVr-i is proportional to the number of molecules destroyed 

 in that layer in a given time ; hence it is between A and B 

 and between C and D, but it is constant between B and C; 

 or the curve representing quantity of hydrogen is straight, 



