. Bulletin. Science. Figure 36.—Side and end elevations of Holmes' magneto generator that was installed at Dungeness. From Minutes of Proceedings of the Institution of Civil Engineers, 1878-1879, vol. 57, pi. 5. machines, with that of the dynamo generator. At the time the magnetoelectric machines were in coinmercial use, the system of practical electrical units had not been worked out; consequently, what little information is available is not always meaningful, but at least one can obtain some sense of the relative merits of the equipment. One method of measuring the output of an electrical ma
. Bulletin. Science. Figure 36.—Side and end elevations of Holmes' magneto generator that was installed at Dungeness. From Minutes of Proceedings of the Institution of Civil Engineers, 1878-1879, vol. 57, pi. 5. machines, with that of the dynamo generator. At the time the magnetoelectric machines were in coinmercial use, the system of practical electrical units had not been worked out; consequently, what little information is available is not always meaningful, but at least one can obtain some sense of the relative merits of the equipment. One method of measuring the output of an electrical machine was to determine it in terms of the chemical cell. In tests inade in 1862 it was shown that a 4-disk Alliance machine was equivalent to 64 Bunsen cells. '' The tests that Jamin and Roger performed in 1863 showed that a 6-disk Alliance machine produced a voltage equal to that of 226 Bunsen cells when the disks were connected in series and, as might be anticipated, a voltage equal to 38 Bunsen cells when the disks were connected in parallel.™ Also, one could obtain a crude comparison of the efficiency of various machines by determining the amount of light that each machine produced per unit horsepower. However, these comparati\'e estimates are necessarily nominal because the candlepower of the arc and the horsepower necessary to produce the candlepower were not measured together, at least until 1880; consequently, such estimates should be considered with caution. Another factor that casts doubt on these estimates is that the figures were used to sell the generators rather than to represent scien- tific measurements. Nevertheless, the figures are indicative of the order of magnitude, and they became ^"Cosmos, 1862, vol. 20, pp. 686-694. 'Jamin and Roger, op. cit. (footnote 64). PAPER 30: DEVELOPMENT OF ELECTRICAL TECHNOLOGY IN THE 19TH CENTURY: III 363. Please note that these images are extracted from scanned page images that may have been digitally enhanced for rea
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