TransactionsPublished under the care of the General Secretary and the Treasurer . 0^ PHASE OF HARMONIC 30° 60° 90 Fig. 7. Showing the variation in the rate of three induction meters with50 per cent harmonic in the current as the phase of the harmonic is changedfrom 0 deg. to 90 deg. 566 ROSA, LLOYD AND REID: INDUCTION METERS. Table III gives the results of 49 runs on three meters made May26th, using a sine wave and a distorted wave due to 25 per centharmonic, peak and flat, as shown in Figs. 1 to 4. The numbersof the runs show the order in which they were taken. For ex-ample, the lst, 4th and
TransactionsPublished under the care of the General Secretary and the Treasurer . 0^ PHASE OF HARMONIC 30° 60° 90 Fig. 7. Showing the variation in the rate of three induction meters with50 per cent harmonic in the current as the phase of the harmonic is changedfrom 0 deg. to 90 deg. 566 ROSA, LLOYD AND REID: INDUCTION METERS. Table III gives the results of 49 runs on three meters made May26th, using a sine wave and a distorted wave due to 25 per centharmonic, peak and flat, as shown in Figs. 1 to 4. The numbersof the runs show the order in which they were taken. For ex-ample, the lst, 4th and 7th were made with a sine wave, and aregrouped together in the table. The actual frequency for each runifi given in the table, but the time of one revolution given in. Fig. 8. Showing the variation in the rate of five induction meters with10, 25 and 50 per cent of harmonic, the phase of the harmonic in each casebeing 0 deg. columns 5, 7 and 9 have been reduced to 60 cycles. The numbersgiven in columns 6, 8 and 10 are the means of the correspondingvalues in columns 5, 7 and 9. Runs two and five were made using a peaked wave and runsthree and six using a flat wave. The phase of the harmonic wasthen shifted 30 deg. and seven runs made in the same order as ROSA, LLOYD AND REID: INDUCTION METERS. 567 before. The third set of seven runs was made with the harmonicat 60 deg., the fourth set at 90 deg., and then three more sets ofruns were made in reverse order with respect to the phase of theharmonic, making in all seven sets of seven runs each. The differ-ence in per cent obtained in Table IV, together with correspond-ing differences in other runs using 10 and 50 per cent harmonic,the detailed results of which are not here given, are shown in PHASE OF HARM
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