A Manual of Electro-metallurgy: Including the Applications of the Art to Manufacturing ProcessesRichard Griffin and Company, 1860 - 166 pages |
Other editions - View all
Common terms and phrases
action alloy ammonia applied arrangement battery black lead boiling brass bronze brush carbonate chloride clean coating colour connected copper plate copper solution covered crucible crystals current of electricity cyanide of potassium Daniell's decomposition cell deposited copper described dipped dissolved earth battery effect electric current electro-metallurgy electrotype electrotypist engraving experiments formed free cyanide fusible alloy galvanic German silver gilding give gold grains Grove's gutta percha heat hydrochloric acid immersed inches iron medal melted mercury method mixture mould muriatic acid negative nitric acid object obtained operation ounces oxide piece of copper plaster of Paris plating solution platinum pole porous cell portion positive electrode potash precipitate prepared purposes quantity salt saturated silver solution Smee's solder solu solution of sulphate sulphate of copper sulphuric acid surface taken thickness tion varnish voltaic voltaic pile washed Wollaston's zinc and copper zinc plate
Popular passages
Page 20 - I had in my power to regulate at pleasure, by the thickness of the intervening wall of plaster of Paris, and by the coarseness or fineness of the material. I made three similar experiments, altering the texture and thickness of the plaster each time, by which I ascertained that if the...
Page 7 - ... impressions in relief with great fidelity. It is, therefore, evident that this principle will admit of improvement, and that casts and moulds may be obtained from any form of copper. This rendered it probable that impressions may be obtained from those other metals having an electronegative relation to the zinc plate of the battery.
Page 6 - JACOBI, at St Petersburg!), has also made a discovery which promises to be of little less importance to the arts. He has found a method — if we understand our informant rightly — of converting any line, however fine, engraved on copper, into a relief, by galvanic process.
Page 13 - I washed the copper in water, and put it in action as before described. In forty-eight hours I examined it, and found the lines were entirely filled with copper, I applied heat, and then spirits of turpentine, to get off the cement, and, to my satisfaction, I found that the voltaic copper had completely combined itself with the sheet oa which it was deposited.
Page 15 - I accordingly determined to make an experiment on a very prominent copper medal. It was placed in a voltaic circuit, as already described, and deposited a surface of copper on one of its sides to about the thickness of a shilling. I then proceeded to get the deposition off. In this I experienced some difficulty, but ultimately succeeded. On examination with a lens, every line was as perfect as the coin from which it was taken.
Page 155 - Particles aa, fig. 53, could not be transferred or travel from one pole N towards the other P, unless they found particles of the opposite kind bb, ready to pass in the contrary direction: for it is by virtue of their increased affinity for those particles, combined with their diminished affinity for such as are behind them in their course, that they are urged forward: and when any one particle a, fig.
Page 154 - Science, vol. ii. CHAPTER XXXIII. THEORETICAL OBSERVATIONS. WE have described at considerable length the practical details connected with the art of electro-metallurgy, without pausing to inquire into the philosophy of the action of the electric currents by which the effects are produced. It will be unnecessary to enter into a long discussion of the numerous theories that have been advanced from time to time to explain the action that takes place in a battery or decomposing cell, while the current...
Page 11 - I have already mentioned, to about |th of an inch in thickness ; and, with a steel point, endeavoured to draw lines in the form of net-work, that should entirely penetrate the cement, and leave the surface of the copper exposed. But in this I experienced much difficulty, from the thickness I deemed it necessary to use ; more especially when I came to draw the cross lines of the net-work. When the cement was soft...
Page 7 - This phenomenon of metallic reduction is an essential feature in the action of sustaining batteries, the effect, in this case, taking place on more extensive surfaces. But the form of voltaic apparatus which exhibits this result in the most interesting manner, and relates more immediately to the subject of the present communication, may be thus described : — It consists of a glass tube, closed at one extremity with a plug of plaster of Paris...
Page 5 - ... when about to make another experiment, and being desirous of using the piece of wire used in the first instance, I pulled it off the coin to which it was attached. In doing this, a piece of the deposited copper came off with it ; on examining the under portion of which, I found it contained an exact mould of a part of the head and letters of the coin, as smooth and sharp in every respect as the original on which it was deposited.