;398 



REPOBT— 1886. 



December 1 . — Another experiment started ; tubes I. and II. as before, but a layer 

 of paraffin over the vessels of tube III., and a siphon levelling-tube full of paraffin 

 dipping into it and left, open, as shown in fig. 4. The current strength decreased 

 eteadily from -01 to "OOS. 



In tube II. the chief precipitate occurred again close to the Na^SO^ end. 

 In tube I. the distances vs^ere 16'5 centims. from Na^SO^ end. 



67-8 „ Ba„Cl end. 



In tube III. they were 20-2 „ Na'SO^ end. 



68-3 „ Ba„Cl end. 



Precipitates appeared on Dec. 3. 



December 3. — Paraffin levelling-tubes now provided for both tubes II. and III. 

 The ring formed well in all three now, and quite blocked the tube. The distances 

 were — 



15 centims. 

 69 



In tube I. 



end. 



In tube II. 



In tube III. 



(21 



] 66-4 

 21-5 

 66-7 



from Na,SO 

 BaCl.. " 



Na,,SO.j end. 

 BaClj end. 

 Na^SO^ end. 



Bad, 



Current strength in each tube about '01 ampere. 

 December 5. — Same experiment repeated with 22 cells, tube I. being the only 



one without paraffin. The distances were- 



From Na„S04 end 



I. II. 



16-1 22-2 



From BaCl,> end 67-6 64-8 



Current strength about "015. 

 December 5. — The same experiment repeated, but with 

 December 9 a ring had formed in II. and III., but not in I, 

 Distances of ring — 



In tube II. I 

 In tube III, 



in. 

 22-2 

 661 



only 3 cells. By 



■■{ 



25-9 

 60-9 

 27-1 

 60-9 from BaOl, 



from Na^SO^ end. 

 from BaClo end. 

 from Na^SO^ end. 



end. 



Fig. 5. 



Ba.SO.iX 



~^Ba Cl2 

 t) 



(^ 



Ba S0l4 



Current strength in each tube about '002 ampere. 



Experiments with tubes of different bore. 



Two fresh tubes were prepared, Nos. IV. and V., of about the same length, but 



smaller in bore than the first 

 three, No. IV. being about -3 

 centim. diameter and No. V. 

 about -22. 



(For more accurate gauging of 

 all the tubes see below.) 



December 9. — Two tubes, Nos. 

 II. and v., arranged in series ; 

 two other tubes, Nos. III. and 

 IV., also arranged in series, and 

 the current from 16 secondary 

 cells allowed to divide between 

 the two pairs, starting at 4 p.m. 

 on December 9. 



Current strength in tubes III. 

 and IV. decreasing from -0075 to 

 •003,5 ; in tubes II. and V. from 

 •005 to •0012. 



By December 11, 10 a.m., a ring was almost completely formed in tube IV., 

 fairly so in V., an indication in III., and nothing in II. By December 12 a ring 

 formed in tube III., and by December 14 it was beginning also in tube II. 

 On December 14 the state of the tubes was as sketched in fig. '>. 



Tube M Decll- 



=^A'. 



,50. 



\BaClz 



TuleV X>ec Id- 



Va.SO^^ 





