US Patent: 426,992
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| Electrical Measuring Instrument
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Patentee:
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| Madison M. Garver (exact or similar names) - Newark, Essex County, NJ |
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Patent Dates:
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| Applied: |
Jan. 18, 1890 |
| Granted: |
Apr. 29, 1890 |
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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: |
| Abstract:
My invention relates to an instrument for measuring the fall of potential between the terminals of a conductor in circuit, and is here shown applied to an apparatus of the general type and construction of that patented to Edward Weston by Letters Patent No. 392,387, dated November 6, 1888.
My invention consists more particularly, first, and broadly, in means for equalizing the temperature in both branches of a divided conductor when said conductor is traversed by a current, or, in other words, of preventing a greater radiation of heat from or to one branch of the conductor than from or to the other branch, and thus obviating differences in resistance in said branches due to the heating of the material composing them, and, seeond, in means for adjusting the scale so as to cause a percentage variation in the relative lengths of the scale-divisions.
Claim:
In combination with the branches of a divided conductor in an electrical circuit, a body capable of conducting heat interposed between said branches and situated near enough to both to receive and emit heat radiation from and to each. |
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