Scientific amusements . 58.—Carbonization of Paper on llie WooJen Portion of a Penholder, conductibility of metals for heat. Take a wooden pen-holder with a metallic end, and fix a piece of paperpartly on the wood and partly on the metal. Heat thepaper above the flame of a lamp. The paper willcarbonize at the side on which it adheres to. the wood-—a bad conductor of heat—but it will remain un-changed, and preserve its whiteness on the side whichis in contact with the metal. g 70 HEAT. Metals strike cold when wc place them in our palms ;by their conductibility they draw the heat from our h
Scientific amusements . 58.—Carbonization of Paper on llie WooJen Portion of a Penholder, conductibility of metals for heat. Take a wooden pen-holder with a metallic end, and fix a piece of paperpartly on the wood and partly on the metal. Heat thepaper above the flame of a lamp. The paper willcarbonize at the side on which it adheres to. the wood-—a bad conductor of heat—but it will remain un-changed, and preserve its whiteness on the side whichis in contact with the metal. g 70 HEAT. Metals strike cold when wc place them in our palms ;by their conductibility they draw the heat from our do not- experience the same effect when we touchwood or cloth. A silver spoon will be burning hot after being dippedin a cup of boiling coffee, but an ivory or wooden spoonwill not be so tig. 59.—ihe CapLivti Imp, Dilatation of Bodies by captive imp. This consists of a tube of thin glass, like a shade, asin illustration, the lower extremity being rendered opaqueby a coat of black varnish. The iQwer portion being heldin the hand, the liquid with which the receptacle is filled DILATATION OF BODIES BY ^EAT. 71 will immediately tise and sustain the small image of blownglass which is contained in the tube. AH gases expand under the influence of heat. No>v» e perceive in the section of the apparatus (Fig. 59) thatthe upper tube terminates in a caplillary tube which is
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Keywords: ., bookcentury1800, bookdecade189, booksubjectscientificrecreations
