TransactionsPublished under the care of the General Secretary and the Treasurer . ch casebeing 90 deg. Table V. The second decimal figure in the differences of thistable is of course uncertain. All these results are plotted in to 9. The results obtained in the runs of May 26th, given inTables III and IV, are plotted in Fig. 5. The maximum variation due to 25 per cent harmonic is, in thecase of meter No. 4, a little less than 1 per cent; being greaterwith the peak than the flat, but not varying much with the phaseof the harmonic. On the other hand, meters 1 and 2 show 568 ROSA, LLOYD AND
TransactionsPublished under the care of the General Secretary and the Treasurer . ch casebeing 90 deg. Table V. The second decimal figure in the differences of thistable is of course uncertain. All these results are plotted in to 9. The results obtained in the runs of May 26th, given inTables III and IV, are plotted in Fig. 5. The maximum variation due to 25 per cent harmonic is, in thecase of meter No. 4, a little less than 1 per cent; being greaterwith the peak than the flat, but not varying much with the phaseof the harmonic. On the other hand, meters 1 and 2 show 568 ROSA, LLOYD AND REID: INDUCTION METERS. smaller errors due to the presence of the harmonic, but greaterchanges due to shifting the phase of the harmonic, both changingfrom slow to fast on the flat wave when the phase is No. 4 runs faster for both peak and flat, and at all phases,than on a sine wave; it is the only meter of the five for whichthis is true. Fig. 6 shows the effect of changing the phase of the harmonicfrom 0 deg. to 90 deg. when using a harmonic of 10 per cent, and. Fig. 10. Showing the variation in the rate of five induction meters withchange of frequency. Fig. 7 shows the same for 50 per cent. Only three meters wereused in these experiments. Fig. 8 shows the effect of changing the harmonic from 10 to25 and 50 per cent, keeping the phase constant. Meters 1 and 3show the least change in rate; meter 4 runs faster and 3 and 5run slower and show the greatest change in rate. Fig. 9 showsfor three meters the same thing as Fig. 8, except that the phase ROSA, LLOYD AND REID: INDUCTION METERS. 569 of the harmonic is 90 deg. different. Meters 1 and 2 show rela-tively small changes, but both run faster on the flat than on thesine curve. Meter 3 runs nearly 3 per cent slower on the 50 percent harmonic than on the sine. The effect of change of frequency on the rate of the meters isshown in Fig. 10. It is relatively small in every case but one. These results show that with suita
Size: 1674px × 1492px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidtr, booksubjectelectricity
