Publisher's Synopsis
Excerpt from Electrical Engineering Measuring Instruments for Commercial and Laboratory
Since the electrical engineering industry began to Show signs of rapid development, numerous types and forms of measuring instruments have been devised by different inventors. Many of these are now obsolete, having given place to instruments with greater refinements and on better principles. Though several of these obsolete types are extremely interesting, and, indeed, instructive, they have not been described in the present work. If information regarding them is required, it will be found in the abridged patent specifications since about 1880. Only those instruments in actual and extensive use at the present day are here considered, and these form so large a body that it seems better not to try to deal with the historical portion of the subject.
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