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ABSTRACT THE object of this instrument, which I had the pleasure of bringing before the Physical Society at their Oxford meeting, is chiefly medical. But it occurred to me that a few
details, mainly constructive, might prove of interest. It was suggested by Mr. Preece, in consequence of a statement made by me in a paper on “Measurement in the Medical Application of
Electricity,” read before the Society of Telegraph Engineers. This statement was to the effect that some difficulty still existed in the trustworthy estimation of induction currents of
medium strength, such as are habitually used for physiological and therapeutical purposes. The French International Conmission had only imperfectly remedied the defiriency by recommending
the universal adoption of a particular pattern of induction coil made by a single German firm, and arbitrarily graduated to a “sledge” apparatus. Mr. Preece thought that a dynamometer, which
may be regarded as a galvanometer of which the moving magnet is replaced by a suspended coil introduced into the circuit, would answer the purpose; since the deflection of the coil is in
one uniform direction, although the currents traversing the circuit are alternate. This very practical hint seemed to offer a prospect of obtaining accuracy in a department of science in
which it is much needed. But on examining existing dynamometers I found only Weber's original instrument, which, in spite of its immense value, is fitted only for a well-appointed
laboratory, and another, male by Messrs. Siemens for the measurement of very intense electric light currents, which erred on the opposite side of deficient delicacy. The dynamometer of
Messrs. Siemens, shown at the French International Exhibition, by means of which the alternating currents of telephones were demonstrated, was probably in the same category, though neither
I, nor the president of the Physical Society could obtain any exact details of its internal arrangements. Access through your institution Buy or subscribe This is a preview of subscription
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ACCESS OPTIONS: * Log in * Learn about institutional subscriptions * Read our FAQs * Contact customer support Authors * W. H. STONE View author publications You can also search for this
author inPubMed Google Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE STONE, W. _A Dynamometer for Alternating Currents of Moderate Strength_ .
_Nature_ 26, 201–202 (1882). https://doi.org/10.1038/026201a0 Download citation * Issue Date: 29 June 1882 * DOI: https://doi.org/10.1038/026201a0 SHARE THIS ARTICLE Anyone you share the
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