80 



Intelligence and Miscellaneous Articles. 



With two zinc knobs, 2*292 millims. apart, the following results 

 were obtained : — 



log a = 1-9050453 1 

 log*=l-5192181 J 



or 



a= 0-80361 

 £ = 33-05355 



(4) 

 (5) 



X. 



S. 



N. 



12/*. 



y- 



Differ- 

 ence. 



Ob- 



Calcu- 











served. 



lated. 





1 



52.1+143.2+ 5.3 = 353 



200 



1402 



745 



6-49 



0-96 



2 



10.1+ 66.2 + 24.3 = 214 



100 



1215 



11-85 



11-71 



014 



3 



37.2+ 63.3 =263 



100 



1215 



15-98* 



15-90 



008 



4 



7.2+ 92.3 + 11.4=334 



100 



1212 



19-30 



1927 



003 



5 



63.3+ 37.4 =337 



100 



1246 



21-60 



21-98 



-0-38 



6 



50.2+ 50.3 =250 



100 



756 



23-81 



2415 



-0 34 



7 



22.3+ 67.4 + 11.5 = 389 



100 



1236 



25-81 



25 90 



-009 



8 



20.2+ 71.3+ 9.4 = 289 



100 



792 



2752 



27-31 



021 



9 



17.2+ 71.3 + 12.4 = 295 



100 



788 



2857 



28-43 



014 



It is seen that the difference between the duration observed and 

 the duration calculated has not reached the millionth part of a 

 second. 



With the same zinc knob3 5 millims. apart, we found 



y=*'(l-a*), . . 



a having the same value as above, whilst 



log#= 1-8226921,1 

 k =66-4802. J 



(6) 



(7) 



Hence the parameter a is independent of the striking-distance. 



The jars which constitute our battery have an external coated 

 surface of about 1243 square centimetres. 



Other physical laws not less important are already brought out by 

 our investigations ; more remain to be discovered, and will form the 

 object of subsequent studies. We shall have the honour to commu- 

 nicate to the Academy the results which may be obtained. 



These researches were made at the Imperial Observatory at Paris, 

 thanks to the kindness of the Administration, who were good 

 enough to place a spare room at our disposal. — Comptes Rendus, 

 April 25, 1870. 



