410 



EEPORT 1886. 



Another experiment on the velocity of hydrogen. 

 Augiist 25. — Closed vessel (fig. 10), containing CuSO^ used as cathode vessel 

 again open vessel, containing dilute H^SO^. 



Tube containing NaCl (5 to 100) with a little phenol-phthallein and a touch of 

 NaHO as before. 







This experiment seemed to go well. The numbers are plotted in fig. 16. 

 Successive appearances of the tube are shown in fig. 15. 



Fi6. 15. 



zn6 



xn. IS 



xvase 



Current Stopped xwiss 

 "jsniiio 



•ssmzo 



xvmso 



Experiment on the velocity of ammonium. 

 August 26. — Made several attempts to get the speed of NH^, using Nessler solu- 

 tion. The indicator is not very distinct : no precipitates seem to work well as 

 indicators ; they introduce disturbances. Fluid detectors answer better. 

 Ammonic sulphate was put in auode open vessel. 

 The tube contained NaCl + Nessler solution. 65 volts applied. 



