366 



Mr. E. Wilson. The Kelvin Quadrant 



quencies of 75 and 43. In section (c) the wave form is very much 

 distorted. The curves of potential and current are plotted in fig. 4. 



Fig. 4. 































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The distortion of the potential curve C was brought about by 

 placing a considerable non-inductive resistance in series with a 

 choking coil, and taking potentials across the choking coil. The 

 instrument under these conditions gives trustworthy results. The 

 phase difference on one or two occasions was such that the curves 

 indicated no work, the deflection under these conditions was zero. 

 The maximum angle of deflection of the needle from its normal 

 position was 7*8°, and tests were made from time* to time, especially 

 with the large potentials on the needle, to see if the instrument was 

 in proper adjustment, by placing both pairs of quadrants in con- 

 nection with the case, and noting the agreement^ between its then 

 zero and the zero when quadrants and needle were put to the case, 

 that is when the instrument was totally discharged. 7 To test the 

 effect of dismounting the instrument the needle was taken^off the 

 suspension and the instrument moved to another room and used for 

 another purpose, on December 10, 1897. On continuing the"experi- 

 ments it was set up by the level only, and found^ to be in proper 

 adjustment. The results of experiment before and after this 

 removal are given in Table II. 



