File:Image from page 629 of "Scientific amusements" (1890).jpg

English: Identifier: cu31924031296126

Title: Scientific amusements Year: 1890 (1890s) Authors: Tissandier, Gaston, 1843-1899 Frith, Henry, 1840- Harry Houdini Collection (Library of Congress) DLC Subjects: Scientific recreations Publisher: London, New York [etc.] Ward, Lock & Co Contributing Library: Cornell University Library Digitizing Sponsor: MSN

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Text Appearing Before Image: Movement of heated air The water rises in the glass. Why .—Because the burn-ing of the paper having absorbed a part of the oxygen,and the volume of confined gas being diminished, thepressure of the outer air has driven back the fluid. Inext fill a goblet with water up to the brim, and cover itwith a sheet of paper which touches both the edge of theglass and the surface of the water. I turn the glass 66 GASES AND LIQUIDS. upside down, and the sheet of paper prevents the waterrunning out, because it is held in place by atmosphericpressure. It sometimes happens that this experimentdoes not succeed till after a few attempts on the part ofthe operator; thus it is prudent to turn the glass over a

Text Appearing After Image: Pressure of the air. basin, so that, in case of failure, the water is not spilt.Having obtained a vase and a bottle, both quite full ofwater, take the bottle, holding it round the neck so thatthe thumb can be used as a stopper, then turn it upsidedown, and pass the neck into the water in the vase.Remove your thumb, or stopper, keeping the bottle in AN EXPERIMENT. 67 a vertical position, and you will see that the water itcontains does not escape, but remains in suspension. Itis atmospheric pressure which produces this phenomenon.If, instead of water, we put milk in the bottle, or someother fluid denser than water, we shall see that the milk

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