Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . is prevented, and the deposition of coppercommences immediately. Any air-bubbles whichadhere to the mould must be dispersed. The solu-tion is prepared by adding 2 oz. of sulphate of copperand 1 fluid oz. of sulphuric acid to every 15 fluidoz. of water. As the copper is deposited on themould, an equal quantity is dissolved ofl from theimmersed plate, so that the original strength of thesolution is maintained except for the loss of water byevaporation.
Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . is prevented, and the deposition of coppercommences immediately. Any air-bubbles whichadhere to the mould must be dispersed. The solu-tion is prepared by adding 2 oz. of sulphate of copperand 1 fluid oz. of sulphuric acid to every 15 fluidoz. of water. As the copper is deposited on themould, an equal quantity is dissolved ofl from theimmersed plate, so that the original strength of thesolution is maintained except for the loss of water byevaporation. 89. Pig. 32 represents a Smees battery, B, of themercurial, or odds and ends ^ form, a new and im- Fig. 32, proved variety, con-nected with a depos-iting apparatus. Alittle mercury is plac-ed in the bottom ofthe glass vessel form-ing the battery. Aplatinum plate is seensuspended in the cen-tre, beneath one ofthe screw-cups. Oneor more zinc plates rest against the side of the vessel,and are in contact with the mercury below. A curvedwire is seen descending through the liquid, insulatedby a glass tube, to the mercury, which it connects, in. COPPER DEPOSITED. 67 common with the zinc, with the plate on the top andthe other screw-cup. This battery will operate ifsimple scraps of zinc are placed in the mercury. Themould in the depositing cell will be seen to be con-nected with the zinc or negative pole of the battery. 90. During the solution of the positive plate, aconsiderable quantity of black matter is left, mostlycarbon, which would injure the copy if allowed tofall on the mould. It is, therefore, best to place bothin a vertical position, the face of the mould beingopposite the piece of copper. The solution may bestirred occasionally, to keep its upper and lower partsof equal strength. 91. When the process is going on well, the de-posited metal will be of a very light copper rapidity of the deposition depends greatly uponthe temperature ; the process proceeds much faste
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectmagnetism, bookyear18
