394 



Dr. Norman Campbell : Experiments on 



13, 14. The constants o£ the circuits are measured by a 

 standard method and compared with those determined by 

 methods involving the use of the theory. 



15. The damping oii the oscillations is investigated as in § 7. 



16, 17. The peak potentials are measured and compared 

 with those predicted by theory. No agreement in any 

 important respect is found between theory and experiment. 



18. In accordance with a suggestion arising out of Prof. 

 Jones's work, the effect of the presence of a choking coil 

 with an air-core in the primary circuit is investigated. It 

 is found that such a choking coil improves in some respects 

 the agreement between calculation and experiment. 



19. An attempt is made to use the measurements of the 

 relation between the peak potential and the primary capacity, 

 when the choking coil is in series with the primary, to deter- 

 mine the inductances and coupling of the circuits. A method 

 for such a determination is given, but the results show that 

 the observations, though qualitatively in agreement with those 

 predicted by the theory, are not so completely in agreement 

 that consistent values for these constants can be obtained. 



20. General conclusions arising out of the research. 



Appendix. 



Yalues of U, U sin </>, and r for different values of c and u* 



c = 0'05. c = 0'10. 



11. 



U. 



r. 



Usin 0. 



u. 



•01 



1017 



45 



1-017 



•02 



•02 



1-022 



32 



1-022 



•04 



•03 



1-025 



26 2 



1025 



•06 



•04 



1026 



228 



1026 



•08 



•05 



1026 



20-5 



1-026 



•10 



•06 



1-026 



18-8 



1025 



•12 



•07 



1025 



175 



1-017 



•14 



•08 



1024 



16-4 



1016 



•16 



09 



1023 



15-5 



1-022 



•18 



•10 



1-021 



148 



1021 



•20 



•12 



1018 



14-2 



1-013 



•25 



•14 



1011 



137 



1-001 



•30 



•16 



1-008 



12-8 



•988 



•35 



•18 



1-005 



121 



•997 



•40 



•20 



1000 



11-8 



•995 



•45 



•30 



•974 



10-4 



•968 



•50 



•40 



•947 



9-77 



•932 



•6 



•50 



'919 



9-34 



•890 



*7 



•60 



•893 



911 



•854 



•8 



•70 



•869 



8-94 



•828 



•9 



•80 



•845 



8-89 



•806 



1-0 



•90 



•823 



8-83 



•788 



1-5 



i-00 



•803 



8-80 



•768 



2-0 

 25 

 30 

 35 



u. 



1035 



1-046 



1052 



1-054 



1-054 



1-054 



1-053 



1-050 



1-047 



1-044 



1-035 



1-025 



1-013 



1-000 



•987 



•975 



•954 



•924 



•900 



•877 



•855 



•762 



•689 



•632 



•587 



•549 



r. 



22-6 



16-1 



133 



120 



110 



101 

 9-5 

 9-0 

 8-64 

 8-35 

 7-84 

 7-37 

 7-13 

 6-80 

 6-71 

 6-56 

 6-37 

 6-28 

 621 

 6-18 

 6-18 

 6-29 

 6-53 

 6-86 

 7-14 

 7 45 



U sin <p , 



1-035 



1041 



1034 



1-047 



1-054 



1-048 



1-038 



1-002 



1-009 



1-017 



1-024 



1-023 



1013 



•999 



•998 



•995 



•990 



•987 



•985 



•983 



•983 



•988 



•994 



•999 



•999 



•996 



