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On the production of ozone by means of a platinum wire made incandescent by an electric current
.Prlnti~g Eabrlcs in Imitation of J~mbroidery.
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is obtnined which preserves all its fermentable properties for an unlimited time. Beer yeast treated in this way keeps its power for a long time, and the presence of the charcoal in the vat presents more advantages than objeetions.--Cosmos.
On t£e _Production of Ozone 5y n~eans of a .Platinum Wire made Incandescent bff an .Electric Current.* By hi. LE Roux. If a platinmn wire, not too large, be made incandescent by an electric current in such a manner that the ascending flow of hot air which has surrounded the wire comes in direct contact with the nostrils, an odor of ozone is perceived. The experiment may be made in the following manner : - - A very fine platinum wire (Tilth to ~ t h of a millimetre), 20 centimetres long, is taken ; it is formed in any shape, and supported in all almost horizontal position in any suitable manner. A glass funnel of 2 or 3 litres is placed over this, so that the air has sufficient access to the wire. As the neck of the funnel is usually too narrow, it is cut so as to ]cave an aperture 2 or 3 centimetres in diameter, on which is adjusted a glass chimney of a suitable length; the object of which is to cool the gases heated by the wire. The wire is then made incandescent by means of twelve or fifteen Bunsen's cells. The gas issuing from the chimney is found to have the odor of ozone; iodized starch-papers are altered in a few miriutes when placed over the chimney. In this case, the air passing over the incandescent wire undergoes a peculiar modification by which it acquires the properties of ozone ; but whether this is effected by the electricity acting as a source of heat, or by its own proper action, must be reserved for further experiments.--Comptes Rendus, April 2, 1860. * From the Loncl.j Edim~ and Dub, Philosophical Mag.~May, 1860.
_Printing FaSrics in Imitation of .Embroiderff.t hi. Perrot has recently discovered a novel mode of ornamenting fabrics by the printing process, so as to produce an effect similar to embroidery. Tills process consists simply in printing, by the aid of rollers, any desired pattern upon a fabric, in a solution of gutta percha, previously bleached by the aid of chlorine, and dissolved by any of the well-known solvents. The fabric so printed is then passed through a box or casing containing woolen, cotton, silk, or other fine flock or colored powder, which adheres only to those parts impressed with the solution, and forms beautifully raised patterns and devices having a fine, soft, and velvety surface. This process recalls to our mind a very similar system which was patented as far back as 1850, by Mr. Auchterlonie, of Glasgow. Our readers will find a notice of Mr. Auchterlonie's system in our 8d vol., 1st series, at page 105, where they will be enabled to compare the two, and judge of their relative values. We have not seen any fabrics ornamented after M. Perrot's plan, but "~From the Lond. Practical Mechanic's Journal~ May~1860.
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is obtnined which preserves all its fermentable properties for an unlimited time. Beer yeast treated in this way keeps its power for a long time, and the presence of the charcoal in the vat presents more advantages than objeetions.--Cosmos.
On t£e _Production of Ozone 5y n~eans of a .Platinum Wire made Incandescent bff an .Electric Current.* By hi. LE Roux. If a platinmn wire, not too large, be made incandescent by an electric current in such a manner that the ascending flow of hot air which has surrounded the wire comes in direct contact with the nostrils, an odor of ozone is perceived. The experiment may be made in the following manner : - - A very fine platinum wire (Tilth to ~ t h of a millimetre), 20 centimetres long, is taken ; it is formed in any shape, and supported in all almost horizontal position in any suitable manner. A glass funnel of 2 or 3 litres is placed over this, so that the air has sufficient access to the wire. As the neck of the funnel is usually too narrow, it is cut so as to ]cave an aperture 2 or 3 centimetres in diameter, on which is adjusted a glass chimney of a suitable length; the object of which is to cool the gases heated by the wire. The wire is then made incandescent by means of twelve or fifteen Bunsen's cells. The gas issuing from the chimney is found to have the odor of ozone; iodized starch-papers are altered in a few miriutes when placed over the chimney. In this case, the air passing over the incandescent wire undergoes a peculiar modification by which it acquires the properties of ozone ; but whether this is effected by the electricity acting as a source of heat, or by its own proper action, must be reserved for further experiments.--Comptes Rendus, April 2, 1860. * From the Loncl.j Edim~ and Dub, Philosophical Mag.~May, 1860.
_Printing FaSrics in Imitation of .Embroiderff.t hi. Perrot has recently discovered a novel mode of ornamenting fabrics by the printing process, so as to produce an effect similar to embroidery. Tills process consists simply in printing, by the aid of rollers, any desired pattern upon a fabric, in a solution of gutta percha, previously bleached by the aid of chlorine, and dissolved by any of the well-known solvents. The fabric so printed is then passed through a box or casing containing woolen, cotton, silk, or other fine flock or colored powder, which adheres only to those parts impressed with the solution, and forms beautifully raised patterns and devices having a fine, soft, and velvety surface. This process recalls to our mind a very similar system which was patented as far back as 1850, by Mr. Auchterlonie, of Glasgow. Our readers will find a notice of Mr. Auchterlonie's system in our 8d vol., 1st series, at page 105, where they will be enabled to compare the two, and judge of their relative values. We have not seen any fabrics ornamented after M. Perrot's plan, but "~From the Lond. Practical Mechanic's Journal~ May~1860.