Chemical lecture experiments . s used for large speci-mens in museums, is half filled with carbon dioxide. Asmall soap-bubble, blown on the end of a thistle-tube, isallowed to fall into the jar, where it will float on the sur-face of the carbon dioxide. Thistle-tube ; large jar (8 or 10 1.) half filled with C02 ; soap sol. 36. Carbon dioxide rotates a paper wheel. — The greatspecific gravity of carbon dioxide may also be shown bypouring a liter of the gas upon a cardboard wheel havingpaper cups on its periphery. As thecarbon dioxide collects in the cupsthe wheel is caused to rotate on itsaxis.
Chemical lecture experiments . s used for large speci-mens in museums, is half filled with carbon dioxide. Asmall soap-bubble, blown on the end of a thistle-tube, isallowed to fall into the jar, where it will float on the sur-face of the carbon dioxide. Thistle-tube ; large jar (8 or 10 1.) half filled with C02 ; soap sol. 36. Carbon dioxide rotates a paper wheel. — The greatspecific gravity of carbon dioxide may also be shown bypouring a liter of the gas upon a cardboard wheel havingpaper cups on its periphery. As thecarbon dioxide collects in the cupsthe wheel is caused to rotate on itsaxis. A piece of stout cardboard is cutinto a circle 20 cm. in diameter, ten ortwelve small paper cups are pastedon the rim, and a long needle is thrustthrough the centre of the wheel (). Two stout copper wires fast-ened to a block of wood may be sobent as to form the bearings on which the needle is set. Inbalancing the wheel it will probably be necessary to add abit of wax at different points before securing perfect equi-. Fig. 125 314 CHEMICAL LECTURE EXPERIMENTS librium. When once arranged, the wheel will rotate quiterapidly if a liter of carbon dioxide is poured into the cups. Cardboard wheel; liter cylinder of C02. 37. Carbon dioxide may be siphoned. — By reason of itsgreat specific gravity, carbon dioxide may be siphoned fromone vessel to another. A 2 1. cylinder is filled with carbon dioxide and its pres-ence established by lowering a lighted candle into it. Anempty cylinder of the same size is likewise tested with thecandle and the absence of carbon dioxide shown. A glasstube, with an internal diameter of not less than 7 mm., bentin the form of a siphon, is inserted in the jar of carbondioxide, which should be placed on a box or other supportabove the table. The siphon is started by gentle suctionwith the mouth on the longer arm, and, when the gas hasfilled the tube, the lower end is thrust into the empty cylin-der. However, as the uppe* cylinder is fixed, it is b
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectchemist, bookyear1901
