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Preventable blast-furnace accidents
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CURRENT TOPTCS.
Polychrome Screens for Color Photography.
L. GIMPEL.
(French Pat., 414,953, I 9 o 9 . ) - - A screen composed of parallel lines is photographed on an ordinary photographic plate, and the developed and fixed image is toned in a primary color (e.g., red) to give an image of as fine a grain and as transparent as possible. The film is now coated with a sensitive enmlsion, and the screen is photographed again on this, but with the lines perpendicular to those of the first image ; after devdopment and fixing, the second image is toned in a second primary color (e.g., blue) and the plate is again coated with emulsion, and exposed to the light through the crossed screen already formed, so that only the portions not colored are affected; it is finally developed, fixed, and the image of small squares toned to the third primary color (yellowL
Metallic T i t a n i u m . L. Wr:TSS and H. KAISER. (Zeit. Anorg., Chem., lxi, 3 4 5 . ) - - T h e paper describes tbe methods of preparation and analysis of amorphous and cast titanium and of titanium " aluminides." A product prepared by fusing the amorphous metal contained 97.4~ per cent. titanium and its specific gravity was 5.T74 at 19 ° to 20 ° C., mean specific heat o. t418 and heat of combustion 24. 4 calories per equivalent. It melts at 22cx3° to 24oo ° ('.
Preventable Blast-Furnace Accidents. R . H . Sw~:~."rsEa. valuable and useful paper on the prevention of such accidents. Mr. Sweetser points Out that accidents can arise from slips and from the different kinds of furnace gas, e.g., the normal gas and the blowing in gas, from explosions in the cold blast pipe, from slips, break outs, and blowing outs. This paper will doubtless be very interesting to blast-furnace men
(Iron Age, lxxxvi, 1o22.)--A
Effect of H e a t on Cast-Iron. (,4met. Mach., xxxiii, 7zo.) ---Heating cast-lron to a dull red heat and allowing it to cool, repeated 3° or 40 times, makes it porous. Cast-iron plates so treated. after being planed down to a ~ - i n c h thickness, will absorb a few drops of oil placed on the top, which will pass through the iron to the lower side of the plate in less than 5 minutes. Specification for the Manufacture and Testing of Retort Material. (Jour. of Soc. Chem. Ind.. ~xx, 2 8 . ) - - A joint subcommittee formed of five representatives elected by the Retort and five of the Refractory Materials Committee of the Institution of Gas Engineers, with the assistance of J,. W. Mellor, of the Staffordshlre County Pottery Laboratory, has drawn up a speeifica tion for this purpose. The leading points covered are: Constituents, Chemical Analysis, Refractoriness, Surfaces and Texture, Contrhction, Inspection and Testing. T o those interested this will be found a valuable paper.
CURRENT TOPTCS.
Polychrome Screens for Color Photography.
L. GIMPEL.
(French Pat., 414,953, I 9 o 9 . ) - - A screen composed of parallel lines is photographed on an ordinary photographic plate, and the developed and fixed image is toned in a primary color (e.g., red) to give an image of as fine a grain and as transparent as possible. The film is now coated with a sensitive enmlsion, and the screen is photographed again on this, but with the lines perpendicular to those of the first image ; after devdopment and fixing, the second image is toned in a second primary color (e.g., blue) and the plate is again coated with emulsion, and exposed to the light through the crossed screen already formed, so that only the portions not colored are affected; it is finally developed, fixed, and the image of small squares toned to the third primary color (yellowL
Metallic T i t a n i u m . L. Wr:TSS and H. KAISER. (Zeit. Anorg., Chem., lxi, 3 4 5 . ) - - T h e paper describes tbe methods of preparation and analysis of amorphous and cast titanium and of titanium " aluminides." A product prepared by fusing the amorphous metal contained 97.4~ per cent. titanium and its specific gravity was 5.T74 at 19 ° to 20 ° C., mean specific heat o. t418 and heat of combustion 24. 4 calories per equivalent. It melts at 22cx3° to 24oo ° ('.
Preventable Blast-Furnace Accidents. R . H . Sw~:~."rsEa. valuable and useful paper on the prevention of such accidents. Mr. Sweetser points Out that accidents can arise from slips and from the different kinds of furnace gas, e.g., the normal gas and the blowing in gas, from explosions in the cold blast pipe, from slips, break outs, and blowing outs. This paper will doubtless be very interesting to blast-furnace men
(Iron Age, lxxxvi, 1o22.)--A
Effect of H e a t on Cast-Iron. (,4met. Mach., xxxiii, 7zo.) ---Heating cast-lron to a dull red heat and allowing it to cool, repeated 3° or 40 times, makes it porous. Cast-iron plates so treated. after being planed down to a ~ - i n c h thickness, will absorb a few drops of oil placed on the top, which will pass through the iron to the lower side of the plate in less than 5 minutes. Specification for the Manufacture and Testing of Retort Material. (Jour. of Soc. Chem. Ind.. ~xx, 2 8 . ) - - A joint subcommittee formed of five representatives elected by the Retort and five of the Refractory Materials Committee of the Institution of Gas Engineers, with the assistance of J,. W. Mellor, of the Staffordshlre County Pottery Laboratory, has drawn up a speeifica tion for this purpose. The leading points covered are: Constituents, Chemical Analysis, Refractoriness, Surfaces and Texture, Contrhction, Inspection and Testing. T o those interested this will be found a valuable paper.