538 



Intelligence and Miscellaneous Articles. 



showed further that in the branching of electrical vibrations 

 the coefficient of self-induction is almost entirely of dominant 

 influence and not the resistance. — Wiener Berichte, March 16, 1893. 



ON THE POTENTIAL OF ELECTRICAL DISCHARGE. 

 BY PROF. HEYDWEILLER. 



The author, at the conclusion of a paper on this subject, gives 

 the following table for the values of the potential of discharge, v, 

 between equal spherical electrodes of radius r, for sparking-distances 

 d cm. ; the experiments were made by means of a spark-micro- 

 meter of suitable construction, so that no appreciable inductive 

 actions were to be feared. The experiments were made at a pressure 

 of 745 mm. and at a temperature of 18° C. ; for an increase of 

 pressure of 8 mm. or for a diminution of temperature of 3°, these 

 values are to be raised 1 per cent, in either case. 





r=2°5 cm. 





r= 1-0 



cm. 



dcm. 



V 



d cm. 





t>. 



0-5 



61-2 



01 





157 



0-6 



72-0 



02 





27-0 



0-7 



81-8 



0-3 





37-9 



0-8 



91-1 



0-4 





48-3 



0-9 



100-3 



0-5 





58-3 



10 



109-5 



0-6 





67-9 



11 



118-6 



0-7 





77-5 



1-2 



1277 



0-8 





86-8 



13 



1367 



10 





1043 



14 



145-6 



1-2 





118-3 



1-5 



154-1 



1-4 





128-8 



1-6 



162-2 



1-6 





137-6 





>' = 0*5 cm. 





r = 0'25 



cm. 



d cm. 



V. 



d cm 





v. 



01 



160 



01 





161 



0-2 



27-9 



0-2 





27-9 



0-3 



37-9 



0-3 





37-8 



04 



48-5 



0-4 





459 



0-5 



• 57-7 



0-5 





52-4 



0-6 



66-4 



0-6 





573 



07 



73-5 



0-7 





610 



0-8 



80-3 



0'8 





634 



0-9 



85-3 



10 





673 



10 



90-0 



1-5 





74-4 



With the accuracy of 1 per cent, which these values possess 

 as derived both from Paschen's observations aud my ow T n, they 

 will be sufficient in most cases for practical purposes, and wiil 

 probably have attained the limit of accuracy possible in such 

 cases. — Wiedemann's Anncden, xlviii. p. 213, 1893. 



ON A PROPERTY OF THE ANODES OF GEISSLER S TUBES. 

 BY E. GOLDSTEIN. 

 While a great number of properties of the kathode of induced 

 discharges in rarefied spaces have been made out, only a few pro- 

 perties of anodes are known. The following communication 

 describes a new property of the anode. If a vessel in which the 

 discharge takes place, one for instance with electrodes at the ends 



