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Updated: May 31, 2025
He also included salts of platina and silver in this general law, and demonstrated that solutions of any of these metals traversing a vein rock containing certain sulphides would be decomposed, and the pure metal deposited.
The platina is shorter than the zincs, to prevent its reaching the quicksilver in the bottom of the cell; and the wax balls on its sides are to insulate it from the zinc plates. This platina should never be allowed to touch the mercury or the zinc. Let the plates, properly screwed together, be now placed in the cell with the Battery Fluid.
I saw a small cask full of 'platina del Pinto', which she told me she could transmute into gold when she pleased. It had been given her by M. Vood himself in 1743. She shewed me the same metal in four phials.
To carry out this law to the best advantage in regard to platina, etc., then with a given length of wire to quadruple the heat we must lessen the radiating surface to one-quarter, and to do this in a spiral, three-quarters must be within the spiral and one-quarter outside for radiating; hence, a square wire or other means, such as a spiral within a spiral, must be used.
It is on this principle, too, that the small concentrated residues of great operations in the arts are almost sure to be the lurking-places of new chemical ingredients: witness iodine, brome, selenium, and the new metals accompanying platina in the experiments of Wollaston and Tennant. It was a happy thought of Glauber to examine what every body else threw away.”
The large number of gold and silver medals which Paul II buried in the foundation of his buildings was noticed, and Platina was by no means displeased to recognize an old pagan Telesma in the fact. Neither Paul nor his biographer were in any way conscious of the mediaeval religious significance of such an offering.
It is true, that there are peculiar productions in the mineral kingdom which are rare, as being found only in few places; but these things are merely accidental in relation to the land, for they belong in property to those parts of the mineral region which we never see. Such are, the diamond of the east, the platina of the west, and the tin of Cornwall, Germany, and Sumatra.
They were boiled for some hours in distilled water, and a piece of very white and transparent amianthus that had been treated in the same way was made then to connect together; they were filled with distilled water and exposed by means of two platina wires to a current of electricity, from one hundred and fifty pairs of plates of copper and zinc four inches square, made active by means of solution of alum.
Murray on Raining Trees; Forms and Relations of Volcanoes; Cuticular Pores of Plants; Volcano of Pietra Mala; Milk Tree of Demarara; Productiveness of Plants and Animals; Height of the Perpetual Snows on the Cordillera of Peru; Gerard's Botanical Journey in the Himala Mountains; Changes of temperature in Plants; Humboldt's account of the Gold and Platina district of Russia; Sir H. Davy on the durability of Stone; Dr.
H. Mill, in the "Technical Repository," as being superior to any previously made known. "The instructions," he says, "given in most elementary works on chemistry for this purpose are either erroneous or not sufficiently explicit." The process answers equally well for either gold or platina. If this be rightly managed, the two liquids will not mix.
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