Chemical lecture experiments . to a fine jet(Fig. 25). The Wolff bottle is thennearly filled with water colored withink. The stem of a 100 cc. pipette isthrust through a rubber stopper in thesecond neck, extending nearly to thebottom of the bottle. The upper endof the pipette is connected with theII porous cell described in Ex. 16. On M_ Si lowering a bell-jar of hydrogen over the- porous cell, the internal pressurebecomes so great that the water isforced out of the Wolff bottle in afine jet to a considerable height. Apparatus (Fig. 25); 2-necked 500 cc. Wolfl bottle; 100 cc,pipette ; porous c
Chemical lecture experiments . to a fine jet(Fig. 25). The Wolff bottle is thennearly filled with water colored withink. The stem of a 100 cc. pipette isthrust through a rubber stopper in thesecond neck, extending nearly to thebottom of the bottle. The upper endof the pipette is connected with theII porous cell described in Ex. 16. On M_ Si lowering a bell-jar of hydrogen over the- porous cell, the internal pressurebecomes so great that the water isforced out of the Wolff bottle in afine jet to a considerable height. Apparatus (Fig. 25); 2-necked 500 cc. Wolfl bottle; 100 cc,pipette ; porous cup used in Ex, 16 ; glass jet to fit second neck ofthe Wolff bottle; bell-jar of II. 19. Diffusion and its application to the fire-damp indi-cator.— The porous cup in Kx. 16 is connected with onelimb of a U-tnbe which is half filled with mercury. Through the open end of the U-tube two insulated annunciator wirestwisted together are thrust, the ends of which arc madebare so as to give good electrical contact. One of the wires. Fia. 25 HYDROGEN 57 dips some distance into the mercury, and the bare end ofthe other wire is held a millimeter above the mercury menis-cus. On lowering the bell-jar of hydro-gen over the porous cup, the internalpressure will cause the mercury in theopen end of the U-tube to rise, therebyclosing an electric circuit, which coil- ed
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectchemist, bookyear1901
