Improved standard Clark cell with low temperature coefficient

Carhart, Henry S.

doi:10.2475/ajs.s3-38.227.402

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“…Carhart [62] proposed the use of an unsaturated solution of zinc sulfate in the Clark cell in order to decrease its emf-temperature coefficient. The original Weston patents also covered the unsaturated form of Weston cell.…”

Section: Weston [61] Andmentioning

confidence: 99%

Standard cells :

Hamer¹

1965

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This Monograph contains information on the construction, maintenance, and characteristics of standard cells. The effects of temperature, pressure, electric current, light, shock, and vibration on standard ceUs are discussed. A history of the realization and maintenance of the unit of electromotive force is also included. A record of international comparisons of the unit of electromotive force is presented as well as information on the constancy of the National Reference Group of Standard Cells. ' This is the Giorgi system [1], which is a part of the Syst^me International d'Unith (SI), adopted in a resolution, 11th General Conference on Weights and Measures. Paris, October 1960. Other systems for the basic units of length, mass, and time have been used. These include the millimeter-milligram-second system of Weber [2], the meter-gram-second system recommended by the first committee of the British Association for the Advancement of Science appointed to consider electrical units [3], the quadrant-(eleventh-gram)-second or Q.E.S, system of Maxwell [4], the foot-grainsecond system used in England for a time (5], and the cgs (centimeter-gram-second system [6] (see Appendix 1). Heaviside also proposed a rationalized system wherein the cgs unit of emf was increased by a factor V4Tr (unit of resistance increased by a factor 477 and the unit of current decreased by the factor V47r [7]). In all of these, the Giorgi system excepted, the magnetic constant (the permeability of free space) is taken as unity. Regardless of which system is chosen the practical system remains unaffected. Additional information on electrical units is given in reference [8].

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Section: Weston [61] Andmentioning

confidence: 99%

Standard cells :

Hamer¹

1965

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Improved standard Clark cell with low temperature coefficient

Cited by 1 publication

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