Discussion on “the induction watt-hour meter” (Hollister), Deer Park, Md., July 2, 1915. (see proceedings for June, 1915)

W. H. Pratt: The author points out that there are two sets of eddy currents or fields to be considered and then proceeds to ignore one of these. In any complete discussion of the meter, it would be quite necessary to consider both of these effects; and since the lag angles of the resultant eddy currents are not necessarily the same, it is quite possible so to proportion the effect that compensation by special lagging devices is not even necessary. This has been done, I believe, in some cases, and certainly has been done in experimental meters.