The Dental record . her E. M. F. and less resistance thanthe Leclanche. De la Rues.—This battery was invented by Mr. Warren de la is a convenient, portable, reliable, and perfectly constant cell,easily worked, and requires little attention. It is suitable for medicalpurposes, or for making electric tests of submarine cables and in-struments. It is very compact. 1,000 elements occupying a space ofless than a cubic yard. An enormous battery of 11,000 of these cellswas constructed by Mr. De la Rue and used by him and Miiller intheir investigations on the stratification of the electric ligh
The Dental record . her E. M. F. and less resistance thanthe Leclanche. De la Rues.—This battery was invented by Mr. Warren de la is a convenient, portable, reliable, and perfectly constant cell,easily worked, and requires little attention. It is suitable for medicalpurposes, or for making electric tests of submarine cables and in-struments. It is very compact. 1,000 elements occupying a space ofless than a cubic yard. An enormous battery of 11,000 of these cellswas constructed by Mr. De la Rue and used by him and Miiller intheir investigations on the stratification of the electric light. Thedifference of potential between the first zinc and last silver of thislarge battery was over 11,000 volts, yet no spark would pass from thepositive to the negative poles until they were brought to within lessthan a quarter of an inch of one another. With a battery of 8,040of these cells the length of spark was only one third of an inch in airunder the ordinary atmospheric pressure ; while under a pressure of. Fig. 15- THE DENTAL RECORD. 23 a quarter of an atmosphere the striking distance was i* inch. Theelectro-motive force of a silver chloride cell is ro3 volt, and thatof one made with silver bromide is cgoS ; three silver chloride cellswith one bromide, coupled in series, give an average E. M. F. of ivolt. This battery consists of a stick of zinc, and a flattened stripof silver, the latter imbedded in fused chloride of silver, the twoplates being immersed in a solution of chloride of zinc or chloride ofammonium, the whole contained in a glass tube or jar, closed by acork or india-rubber stopper. As the zinc dissolves away and hydrogenis evolved at the negative plate the chloride is reduced to metallicsilver, and deposited as the copper is in the Daniell cell, and is therebyrecovered. Marie Davys Battery, ormercuiy sulphate battery, is a zinc-carbonelement of small dimensions. It consists of an outer and an inneror porous cell. In the outer cell the zinc plate with a s
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherlondon, bookyear188
