United States or Indonesia ? Vote for the TOP Country of the Week !
Something certainly of the crystal's faculty for picking out particles akin to itself, and building with them, is shown by the kelp which attracts from the ocean both iodine and bromine often dissolved though they are in a million times their bulk of sea water.
Hence this method is resorted to for restoring the sensibility of the plate when there is reason to believe that the impression would not be a desirable one; as, for example, if a likeness of a child be wanted, and it had moved before the plate had been sufficiently long exposed in the camera, the plate may be restored to its original sensitiveness by re-coating over bromine, as above, thus saving the time and labor of re-preparing the plate for the chemicals.
An article so extensively used in the practice of the Daguerreotypic art as Bromine, is deserving of especial attention, and accordingly every person should endeavor to make himself familiar with its properties and applications. History. This element was discovered in 1826 by M. Balard, in the mother-liquor, or residue of the evaporation of sea-water.
When it is to be employed, pour a small quantity, say fifteen drops, by means of a dropping-tube, into a bottle containing about half an ounce of filtered river water. It will easily be understood that the bromide of iodine can be used with a greater or less quantity of water without altering the proportion which exists between the bromine and iodine."
The fumes of the gas which had reached us irritated our throats and lungs, and made us cough. We decided that this gas was chiefly chlorine, with perhaps an admixture of bromine, but that there was probably something else present responsible for the irritation of our eyes.
It is true that one can distinguish the "smells" of chlorine, of bromine, and of iodine from one another. And there are statements current as to the distinctive smells of metals though they may possibly be due to the action of the metals on organic matter. "Among thy fancies, tell me this, What is the thing we call a kiss? I shall resolve ye what it is." Robert Herrick
M. de Valicours furnishes us with the best method for preparing this mixture: "Into a bottle of the capacity of about two ounces, pour thirty or forty drops of bromine, the precise quantity not being of importance. Then add, grain by grain, as much iodine as the bromine will dissolve till quite saturated. This point is ascertained when some grains of the iodine remain undissolved.
Expose an impressioned plate, that has been sufficient time in the camera to become solarized, to the vapors of bromine, and the impression will be fully developed and exhibit no signs of solarization. The exposure over the bromine most be very brief. Chlorine or iodine will produce the same result. The latter is preferable.
Sulphurous acid and zinc chloride also failed to destroy all the germs of infection. Chlorine, bromine, and mercuric chloride gave the best results; solutions of mercuric chloride, nitrate, or sulphate diluted to 1 part in 1,000 destroy spores in ten minutes. R. Koch. By N.B. WOOD, Member of the Civil Engineers' Club, of Cleveland.
The day after the gas attack I reported to headquarters, that in my opinion the gas used was chlorine with possibly an admixture of bromine, and that a mask with a solution of "Hypo" to cover the nose and mouth would probably absorb the gas and destroy its effectiveness.
Word Of The Day