40 



Prof. E. Taylor Jones on Electrical 



The numbers are given in millionth s of the square of the 

 volts at the plates of: the secondary condenser. 



Table IV. 



No. of 

 Maximum. 



Case I. 

 Maxima. 



Case II. 

 Maxima. 



Case III. 

 Maxima. 



Case IV. 

 Maxima. 



Obs. 



Calc. 



Obs. 



Calc. 



Obs. 



41-1 



88-31 

 6052 

 12-49 

 18-62 

 2553 

 1390 

 4-137 

 7-875 



Calc. 



430 

 87-0 

 62-8 

 130 

 310 

 42-0 

 230 

 8-0 

 210 



Obs. 



Calc. 



1 



45 



86-68 

 44-00 

 11-20 

 30-02 

 21-06 

 4-59 

 11-04 



45 



82-2 

 43-0 

 17-5 

 43-0 

 29-5 

 7-5 

 22-3 



51-33 

 115-2 

 78-36 

 15-17 

 26-89 

 36-14 

 18-88 

 5-414' 



12-56 



1 



52-0 

 108-6 

 780 

 149 

 42-0 

 54-5 

 27-0 

 12-0 

 290 



48-2 

 112-7 

 88-9 

 25-84 

 14-54 

 30-11 

 24-22 

 8-42 

 5-622 



48-0 

 1060 



88-0 

 28-5 

 27-0 

 495 

 40-0 

 140 

 15-0 



2 



3 



4 



5 



6 



7 



8 



9 



It will be seen that in the first group of waves, preceding 

 the interval (about *003 to '0035 sec), when the secondary 

 potential is small and varies slowly, the maxima of the 

 photographs are fairly closely proportional to the calculated 

 values. In the second group the ratio of the observed to the 

 calculated values of the maxima is considerably smaller, and 

 there is a further drop in this ratio between the second and 

 third groups. It seems, therefore, that the system loses 

 energy rapidly in the intervals between the groups of waves 

 of secondary potential. Now it is in these intervals that the 

 energy exists mainly in the primary circuit, and that the 

 potential at the plates of the primary condenser attains its 

 highest values. Loss of eneigy, due to insufficient insulation 

 or absorption in the paraffin-paper condensers, would there- 

 fore occur most rapidly during these intervals, and this 

 appears to be the probable cause of the abnormal drop in the 

 secondary potential from group to group of waves. Apart 

 from this the wave of secondary potential represented by (3) 

 agrees fairly well with the indications of the electrometer. 



(4) The Musical-arc Curves. 



If the primary coil, in series with the 11*87 mfd. con- 

 denser, is connected to the terminals of an arc lamp with 



