Object Lessons In Elementary Science (volume 1); Following The Scheme Issued By The London School…

Paperback | October 12, 2012

byVincent Thomas Murch, Vincent Thomas Murche

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1896 edition. Excerpt: ...water in the basin. Now light the lamp and the candle, and try to find out how they burn. Let us start with the lamp. The wick is a porous substance; the greater part of it lies in the liquid paraffin. The liquid rises through the pores of the wick and burns at the top, just as we saw the turpentine burn at the top of the cane. But how can this happen with the candle, for the candle is made, not of liquid oil, but of solid tallow? See, since I lighted the wick just now, it has burnt and given out just enough heat to melt the tallow; that is, to change it from the solid to the liquid state. Look at the little circle of liquid tallow all round the wick. This liquid, like all others, is quickly absorbed by the porous wick, and runs up to the top, where it is burnt. The readily absorbent nature of the wick may be shown by the following experiment.--Take a piece of wick, such as is used in benzoline lamps, and after soaking it in water, dip one end in a tumbler of water, and let the other end hang down on the outside. Almost at once the boys will see the water drip, drip from the lower end of the wick, and if an empty vessel were now placed underneath, it would, after a time, become filled with the water from the tumbler. How does this come about? The water from the tumbler rises through the pores of the wick till it reaches the top, and then runs down through the pores in the same way, and drops into the vessel below. It rises through the pores just as water rises through the sponge, piece of sugar, chalk, and bread. All these substances are absorbents. Now drop some water on the table, and show how to take it up with a little roll of blotting-paper. Let the boys observe that you merely dip one end of the roll into the water, and at once the...

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1896 edition. Excerpt: ...water in the basin. Now light the lamp and the candle, and try to find out how they burn. Let us start with the...

Format:PaperbackDimensions:58 pages, 9.69 × 7.44 × 0.12 inPublished:October 12, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217734545

ISBN - 13:9780217734547

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