. Journal. in a circular,recommends the following mixtures:—For white fire,1 part shellac, fused with a parts barium nitrate, groundand mixed per cent, of magnesium powder. Forred lire, 1 part shellac, 5 parts strontium nitrate, fused together, ground, and mixed with 2*5 percent, of mag-nesium powder. These mixtures can be made intoribbons about a fingers breadth, or they may be chargedinto thin /ic tubes so as to make magnesium burning, the zinc case bums «ith its contents.—J. T, XXIL—GENERAL ANALYTICAL CHEMISTRY. Apparatus for Volumetric Analysis. Dingl. Polyt. , 502—
. Journal. in a circular,recommends the following mixtures:—For white fire,1 part shellac, fused with a parts barium nitrate, groundand mixed per cent, of magnesium powder. Forred lire, 1 part shellac, 5 parts strontium nitrate, fused together, ground, and mixed with 2*5 percent, of mag-nesium powder. These mixtures can be made intoribbons about a fingers breadth, or they may be chargedinto thin /ic tubes so as to make magnesium burning, the zinc case bums «ith its contents.—J. T, XXIL—GENERAL ANALYTICAL CHEMISTRY. Apparatus for Volumetric Analysis. Dingl. Polyt. , 502— Grcincr describes tlie burette shown in Fig. 1. Abrass rod d, carried by a suitable stand, has its bottomend formed into a stopper/, whilst at its upper end is anarm c, encircling t he burette and forming a screw to the tube is a ring n, hearing a, tooth 6, Fig. using the burette the ring u is so fixed that the tuberests air-tight on the stopper/. On turning the tube the. t ooth // slides rip the screw path r, by which the tube israised from/, and its contents can escape. A. Bourdon describes a burette arrangement •which re-quires no stand. One neck of a three-necked bottle con-tains a dipping tube V, Fig. 3 ; the second neck contains a T lube T, which connects Y, the burette B, and thejet O. On compressing the indiarubber ball F, placedin the third neck, closing the clamp D, and opening theclamp (, the burette B is tilled with acid. The scale 8is so placed that its zero point coincides with the top ofthe liquid column.—J. T. A- w Laboratory Apparatus fur the Continuous FroSt. Gaston Tissandier. Bull, de laSoc. ( him. de Paris, -March .., forms of apparatus usually employed for the preparation of hydrogen, carbonic acid and sulphurettedhydrogen, have tins serious disadvantage—viz., that therate of production of the gas gradually diminishes as theacid employed becomessaturuted with the particular salt
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
