Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 284
ed by the thin film of goldwhich covers it, from which results astrengthening of all the darks. The mer-cury, on the contrary, which, in the stateof an infinite number of small globules,forms the lights, is augmented in its soli-dity and brightness, by its union with thegold, from which results a… … ed, a is a vessel suffici ntly large to takethe plate, aud not more than half an inchwide : this is filled with disilled water,which is heated by means of a spirit-limp ;b is a stand supporting the trough, and ca holder for the plate. After tbeTplate hasbeen immersed for a* few minutes, it is tobe…
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