United States or Kosovo ? Vote for the TOP Country of the Week !
For example, if anyone will take a good bisulphide of carbon prism, and by its means throw a clear spectrum on a sheet of white paper, and then get a number of people to mark upon the paper the extreme limits of the spectrum as it appears to them, he is fairly certain to find that their powers of vision differ appreciably.
It should be well stirred in, after the day's work is done, when the bath will be in proper condition for working next day. The mixture is made by shaking together, in a glass bottle, one ounce bisulphide and one gallon of the plating liquid, allow to stand until excess of bisulphide has settled, and decant the clear liquid for use as required.
The cover being closed, the carbon disulphide is admitted, and passing through the wool, the greasy matter is dissolved, and along with the solvent enters a reservoir. The machine is now set in motion, and the bulk of the solvent is drawn off. Cold water is then admitted, and the machine being again caused to rotate, the whole of the bisulphide is expelled.
Our bisulphide of carbon, for example, which, employed in prisms, is so eminently suitable for experiments on the visual rays, is by no means so suitable for these ultra-violet rays. Flint glass is better, and rock crystal is better than flint glass. A glass prism, however, will suit our present purpose.
Those of irritant poisoning with corrosion, and staining of a dark brown or yellow colour. Treatment. Stomach-pump and emetics, carbonate of sodium, amylaceous fluids, gruel, arrowroot, starch, etc. Analysis of Organic Mixture containing Iodine. Add bisulphide of carbon, and shake. The iodine may be obtained on evaporation as a sublimate.
It will be necessary first to dissolve everything out by, say, hot turpentine, then successively treat the residue with bisulphide carbon, benzol, ether, chloroform, naphtha, toluol, alcohol, and other probable solvents. After you can go no further, distil off all the solvents so the asphalt material has a tar-like consistency.
Recent experiments at Rothamsted show that in the absence of phosphates no nitrification will occur. Further proof of the ferment theory is afforded by the fact that antiseptics are fatal to nitrification. In the presence of a small quantity of chloroform, carbon bisulphide, salicylic acid, and apparently also phenol, nitrification entirely ceases. The action of heat is equally confirmatory.
I personally attended only two botany lectures during the whole course. At the first some practical joker had spilled a solution of carbon bisulphide all over the professor's platform, and the smell was so intolerable that the lecture was prorogued. At the second, some wag let loose a couple of pigeons, whereupon every one started either to capture them or stir them up with pea-shooters.
When dry, the object should be suspended under a glass shade and exposed to a stream of sulphuretted hydrogen gas; or it may be immersed in a solution of 1 part of phosphorus in 15 parts of bisulphide of carbon, 1 part of bees-wax, 1 part of spirits of turpentine, 1 part of asphaltum, and 1/8 part of caoutchouc dissolved in bisulphide of carbon.
Whitewash is a good remedy, as it buries both mites and eggs beneath a coating of lime from which they cannot emerge. Pure kerosene or a solution of carbolic acid in kerosene, at the rate of a pint of acid to a gallon of oil, is an effective lice-paint. Another substance much used for destroying insects or similar pests is carbon bisulphide.
Word Of The Day