Upon this particular day it was very gloomy in the travelling hospital; on account of the high seas it had been necessary to close the iron port-lids, which made the stifling sick-room more unbearable. Sylvestre was worse; the end was nigh. Lying always upon his wounded side, he pressed upon it with both hands with all his remaining strength, to try and allay the watery decomposition that rose in his right lung, and to breathe with the other lung only. But by degrees the other was affected and the ultimate agony had begun.英文原著 · 《AN ICELAND FISHERMAN》
Light--Optics--Solar Spectrum--Decomposition of Light--Light, Heat, and Actinism--Blue Paper and Color for the Walls of the Operating Room-- Proportions of Light, Heat and Actinism composing a Sunbeam-- Refraction--Reflection--Lenses--Copying Spherical Aberration-- Chromatic Aberration, .英文原著 · 《American Hand Book of the Daguerreotype》
Iodides.--The iodide treated with the oil of vitriol, instantly produces a considerable deposit of iodine; and if the mixture be heated, intense violent vapors are disengaged. The reaction is due to the decomposition of oil of vitriol by iodohydric acid, water and sulphurous acid being formed, and iodine set free. The iodides in solution are decomposed by chlorine, iodine being precipitated, the smallest quantity of which in solution is instantly detected by its imparting to starch an intensely blue color.英文原著 · 《American Hand Book of the Daguerreotype》
The chlorides dissolve in water; give with nitrate of silver, a white precipitate, even in highly diluted solutions, becoming violet colored and finally black when exposed to the light. The rapidity of the change of color is proportioned to the intensity of the light. It is insoluble in nitric acid, but readily soluble in ammonia; it fuses without decomposition, forming, when cold, a tough, horny mass, and is reduced by hydrogen and by fusion with carbonate of soda, or with resin.英文原著 · 《American Hand Book of the Daguerreotype》
Hydrofluoric Acid (Fluorohydric Acid).--This acid is used to form some of the most volatile and sensitive compounds employed in the Daguerreotype. It is one of the most dangerous bodies to experiment with: it is volatile and corrosive, giving off dense white fumes in the air. It combines with water with great heat. At 32 deg. it condenses into a colorless fluid, with a density 1.069. It is obtained from decomposition of fluorspar by strong sulphuric acid. It readily dissolves the silica in glass, and consequently cannot be kept in a vessel of that material. It is prepared and kept in lead.英文原著 · 《American Hand Book of the Daguerreotype》
Light--Optics--Solar Spectrum--Decomposition of Light--Light, Heat, and Actinism--Blue Paper and Color for the Walls of the Operating Room-- Proportions of Light, Heat, and Actinism composing a Sunbeam-- Refraction--Reflection--Lenses--Copying Spherical Aberration-- Chromatic Aberration.英文原著 · 《American Hand Book of the Daguerreotype》