. Inductive elementary physical science with inexpensive apparatus, and without laboratory equipment . ough the tube, and you have aminiature diving-bell. Inference. Why does notthe upward pressure of thewater force it up into the Ap-paratus ? See Aux. 9. NoTic. — The lack of delicatescales makes Exp. 35 impossible inmost schools, hence the teachershould construct Aux. 10, and useinstead. Exp. 35. Plug everyhole in the Apparatus (oruse a large bottle), andevery hole but one in thestopper ; in this insert ashort glass tube, and attachto it a short rubber tubewith a plug in the the A
. Inductive elementary physical science with inexpensive apparatus, and without laboratory equipment . ough the tube, and you have aminiature diving-bell. Inference. Why does notthe upward pressure of thewater force it up into the Ap-paratus ? See Aux. 9. NoTic. — The lack of delicatescales makes Exp. 35 impossible inmost schools, hence the teachershould construct Aux. 10, and useinstead. Exp. 35. Plug everyhole in the Apparatus (oruse a large bottle), andevery hole but one in thestopper ; in this insert ashort glass tube, and attachto it a short rubber tubewith a plug in the the Apparatus orbottle on scales, then remove the plug, and suck out all the air you can. Pinch tlietube to prevent air entering whenever you stop to restyour throat, and stop sucking when you can exhaust nomore air; also be careful not to let water from yourmouth enter the tube, as a few drops might spoil the ex-periment ; replace the plug, and return the Apparatus orbottle to -its scale-pan. If the scales are delicate enough,and you have performed the experiment well, it willweigh less than Exp. 34. 32 INDUCTIVE PHYSICS. Inference. Compare with this th& second fact learnedabout water. For cheap but excellent home-made apparatusfor this experiment see Aux. 10. Exp. 36. Insert the stopper tightlyin the Apparatus, pour mercury intothe hole partly filled by the rattan plug,and. suck air from the Apparatus. (Donot allow mercury to touch a gold ring.) Inference. What causes the mercuryshower ? See Aux. 11.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysics, bookyear1897
