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Updated: June 7, 2025
It is only removed with difficulty, and generally leaves a dark coating on the dish, which is separated by repeated ignitions and treatment with acid. It is already known that manganese may be separated as the peroxide from its nitric acid solution.
The minister's desk is lofty, and has once been honored with a coating of paint; as well as the huge sounding-board, which to your great amazement protrudes from the wall at a very dangerous angle of inclination over the speaker's head.
After letting the emulsion stand for a few minutes to ripen, I pour in slowly about eight ounces of alcohol, stirring all the time, and keeping the emulsion warm; the emulsion will adhere to the stirring-rod and the bottom of the vessel in a soft mass, and all that is now required is to pour away the alcohol, allow the emulsion to cool, tear it into small pieces, wash in several changes of cold water, make up the quantity to ten ounces, and strain; it is then ready for coating.
The plate may then be brought safely to the light and should be washed thoroughly either in running water for half an hour or in at least twelve changes of fresh water. Care must be taken not to touch the film side of the plate during development or fixing, as the gelatine coating becomes very soft and will show the slightest scratch or abrasion.
When you wish to use it, pour some into a plate, or any other vessel of the same kind, sufficient to cover the proof; then, after having added to it a drop of ammonia, immerse the plate in it as soon as you take it out of the mercury-box, after having wiped its back and edges, and agitate the mixture quickly from right to left, so as to dissolve rapidly the coating of iodide of silver as usual.
It is not necessary that the coating applied should harden quickly, as it assumes soon after its application a firmness sufficient to prevent it from running off the roof. Coal tar is to be classed among lacquers. If it has been liberated by distillation from the volatile oils, it is made better suited for the purpose than the ordinary kind.
The bottom of the floor was covered with a fine dust, which had sifted down in the course of ages from the inside coating of the mound, but it was not deep enough to conceal a bar of gold, and, with his lantern and his foot, the captain made himself sure that not a piece was left.
The construction is the same as before, only instead of the lamp filament a small platinum wire p, sealed in a stem s, and bent above it in a circle, is connected to the copper wire w, which is joined to an inside coating C. A small stem s1 is provided with a needle, on the point of which is arranged to rotate very freely a very light fan of mica v.
We were still in doubt as to the cause of the awful phenomenon which was taking place, when, as I happened to touch the companion hatch, I found that it was gritty, as if covered with dust, while our lips and eyes informed us that a shower of light subtle ashes was falling the deck being soon covered with a thick coating of them.
I said to myself, he is tired, and must grow dizzy. I will risk another dollar on him. He started again. Made the trip again. Slipped on the smooth coating I almost had him. But an infamous crevice saved him. He was with us once more perfectly sound. Time, eight minutes, forty-six seconds. I said to Dan, "Lend me a dollar I can beat this game, yet." Worse and worse. He won again.
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