US Patent: 392,387
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| Electrical Measuring Apparatus
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Patentee:
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| Edward Weston (exact or similar names) - Newark, Essex County, NJ |
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Patent Dates:
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| Applied: |
Aug. 17, 1888 |
| Granted: |
Nov. 06, 1888 |
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Patent Pictures:
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Joel Havens
OWWM Forum images of a Weston Direct-Reading Voltmeter
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Description: |
| Original application filed 17 Mar., 1888. Divided and this application filed 17 Aug., 1888.
Abstract:
My apparatus is more particularly designed for the measurement of the electromotive force of electrical currents in volts. Its principle is as follows: To organize and construct an apparatus wherein the current to be measured in circulating through a coil or loop in the circuit, which coil is supported so as to be free to move in a uniform magnetic field, shall cause a movement of said coil due to the resultant effect thereupon of the said current and the magnet-poles; to oppose to the motion of said coil so produced a uniform resilient resistance, so that the extent of moment of said coil shall be directly proportional, or very nearly so, to the strength of the actuating-current, or, when said current is previously caused to traverse an interposed electrical resistance, to the electromotive force of said current; and, finally, to indicate the extent of such movement and hence the corresponding electromotive force upon a suitable scale; also, to prevent undue oscillation of the coil by combining therewith a mass of diamagnetic metal to which an intense magnetic field acts as a retarding medium, thereby producing a magnetic dash pot or brake, and to combine such diamagnetic mass with the said coil in such a way as to enable said mass to act to the maximum magnetic and mechanical advantage in checking said oscillation.
Claim:
A permanent magnet and movably supported in the field of force thereof a paramagnetic body inclosed in a continuous mass of diamagnetic metal, the said mass operating to retard or oppose the motion of said paramagnetic body. |
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