Abstract
THE second volume of “Elektrotechnik in Einzel-Darstellungen,” of which the first was mentioned in these columns some time ago, appears in the above form and fully sustains, if it does not surpass, the excellent character of the first volume. Besides the general normal parallel running of alternators, including, of course, polyphase machines, the disturbing influences which make parallel running difficult or impossible are discussed. To the mathematically inclined, the theoretical explanation of the phenomena met with in the parallel running of alternating-current machinery offers exceptional opportunity for a fine display of mathematical calculations and formulae. Fortunately, Dr. Benischke is not so inclined, and in his preface declares that the physical explanation of the phenomena appeals more directly to one's intelligence than the mathematical, and that, in the cases under consideration, the swinging and falling out of step of alternators, the mathematical method is not much good, as it is not possible thereby to prophesy whether two machines will run in parallel or not. This is, of course, what has been found in practice, and it is now usual in the construction of alternators to so design them that means for the prevention of swinging (Le Blanc's damping rings) can be placed in position should it prove necessary. The author is to be particularly congratulated on chapters x. and xi., in which these matters are discussed, for the very clear and logical manner in which he has put them.
Der Parallelbetrieb von Wechselstrowimaschinen.
By Dr. Gustav Benischke. Pp. 55. (Brunswick: Friedrich Vieweg und Sohn, 1902) Price M. 1.20.
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G., C. Der Parallelbetrieb von Wechselstrowimaschinen . Nature 67, 101 (1902). https://doi.org/10.1038/067101a0
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DOI: https://doi.org/10.1038/067101a0