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Formation of ozone
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n e x t taken, and rubbed with ~ sanded brush, to depolish the surface and heighten the effect of the picture. The plate, after cleaUsing¢i~ laid on a sheet of paper, on a table containing diluted alcohol. The: carbon point is now brought face down in contact with the p l a t e / a paper sheet is l~id upo,, it, a~ul by a simple roller, tile aloolmls and' air bubbles arc forced from between plate and print, and the two made to adhere firmly. The plate with film is now immi~rsed in water of about 100 ° F. and developed, leaving a fihn of varyihg thickness on ttle plate through which the lights are in the thin parts,, and the shades in the thick insolubhr parts. The character of the metallic surface gives ~t peculiar tone to the picture, and the shades may be varied by usirlg colored gelatim To render his pictures more durable, Mr. Wenderoth attaches them by a simple method hermetically to glass plates. The same artist is operating a photo-zincographic process, which is new in some re. spects, an illustration of which we will shortly be able to give..
Formation of O z o n e . ~ D r . Pincus states that ozone is formed during the burning of hydrogen ; and that if a flame of this gas is allowed to burn from a fine point, the smell of ozone can he distinctly recognized. This statement recalls to mind the announcement made some time since by Loew, of New York, that ozone might be obtaine~" in sufficient quantity for purposes of lecture demonstration, by simply blowing the heated air on the edge of an ordinary Bunsen flame, with the aid of a glass tube, into a glass receiver, containing the ordinary reagent for testing an oxidizing a g e n ~ i o d i d e of potassium~ acetic acid and stareh~when tt, e blue coloration of the iodide of starch almost instantly makes its appearance. At the time, Loew's" announcement met with some objectors, who sought to explain the phenomenon by assuming that the oxidizing process originated with certain oxidized nitrogen compounds formed by the heat of the flame. From the fact, however, which is well-known to chemists, that it is impossible to unite nitrogen and oxygen directly, by arty means short of the electrical spark, the explanation of Loew would seem to be the correct one. To Determine the Value of Aniline Colors.--Armand M(iller suggests the use of collodionized glass plates upon which an alto. holic solution containing a known percentage of the color to be esti, mated is fixed, and compared with similar films containing certain known quantities of a normal color. By this process he deelares it possible to determine the value of different colors with great nicety.
~59
n e x t taken, and rubbed with ~ sanded brush, to depolish the surface and heighten the effect of the picture. The plate, after cleaUsing¢i~ laid on a sheet of paper, on a table containing diluted alcohol. The: carbon point is now brought face down in contact with the p l a t e / a paper sheet is l~id upo,, it, a~ul by a simple roller, tile aloolmls and' air bubbles arc forced from between plate and print, and the two made to adhere firmly. The plate with film is now immi~rsed in water of about 100 ° F. and developed, leaving a fihn of varyihg thickness on ttle plate through which the lights are in the thin parts,, and the shades in the thick insolubhr parts. The character of the metallic surface gives ~t peculiar tone to the picture, and the shades may be varied by usirlg colored gelatim To render his pictures more durable, Mr. Wenderoth attaches them by a simple method hermetically to glass plates. The same artist is operating a photo-zincographic process, which is new in some re. spects, an illustration of which we will shortly be able to give..
Formation of O z o n e . ~ D r . Pincus states that ozone is formed during the burning of hydrogen ; and that if a flame of this gas is allowed to burn from a fine point, the smell of ozone can he distinctly recognized. This statement recalls to mind the announcement made some time since by Loew, of New York, that ozone might be obtaine~" in sufficient quantity for purposes of lecture demonstration, by simply blowing the heated air on the edge of an ordinary Bunsen flame, with the aid of a glass tube, into a glass receiver, containing the ordinary reagent for testing an oxidizing a g e n ~ i o d i d e of potassium~ acetic acid and stareh~when tt, e blue coloration of the iodide of starch almost instantly makes its appearance. At the time, Loew's" announcement met with some objectors, who sought to explain the phenomenon by assuming that the oxidizing process originated with certain oxidized nitrogen compounds formed by the heat of the flame. From the fact, however, which is well-known to chemists, that it is impossible to unite nitrogen and oxygen directly, by arty means short of the electrical spark, the explanation of Loew would seem to be the correct one. To Determine the Value of Aniline Colors.--Armand M(iller suggests the use of collodionized glass plates upon which an alto. holic solution containing a known percentage of the color to be esti, mated is fixed, and compared with similar films containing certain known quantities of a normal color. By this process he deelares it possible to determine the value of different colors with great nicety.