. Laboratory exercises in elementary physics. re are not a sufficient number of gas taps for a sec-tion, the arrangement as shown in Fig. 104 may be useful. Aglass bottle is provided with a corkpierced by several glass tubes. Thiscork should be well soaked in meltedparaffine. One of these glass tubes isconnected with the gas tap, the otherswith the tubes leading to Bunsen burn-ers. In this way one gas tap can bemade to serve from two to four independent regulation is desired,the tube leading to each burner may beprovided with a screw clamp t or somesimilar device. Glass tubing conn
. Laboratory exercises in elementary physics. re are not a sufficient number of gas taps for a sec-tion, the arrangement as shown in Fig. 104 may be useful. Aglass bottle is provided with a corkpierced by several glass tubes. Thiscork should be well soaked in meltedparaffine. One of these glass tubes isconnected with the gas tap, the otherswith the tubes leading to Bunsen burn-ers. In this way one gas tap can bemade to serve from two to four independent regulation is desired,the tube leading to each burner may beprovided with a screw clamp t or somesimilar device. Glass tubing connectedwith short pieces of rubber tubing, willserve well for temporary piping. Wherea branch tap is to be led off, a smallbottle provided with a glass tube may beused. By such devices as these, if thelaboratory contain but one or two gastaps, it is not a difficult matter to provide enough separateburners. * For arrangement for keeping mercury clean and dry see Sut-tons Volumetric,Analysis, p. 413. f See Eimer & Amends Catalogue, page Fig. 104. 212 APPENDIX A. SOME USEFUL BOOKS. Chute. Practical Physics. Boston, D. C. Heath & Principles of Physics. New York, Macmillan & Units and Physical Constants. New York, Macmil- lan & Elementary Ideas, Definitions and Laws of Dynamics. Cambridge, Mass., University & Bergen. Elementary Physics. New York, Henry Holt & College. Descriptive List of Elementary Physical Experiments Intended for Use in Preparing Students for Harvard College. Cambridge, Mass., University Experimental Science. New York, Munn & Physical Problems. New York, Macmillan & Physical Measurements. London, J. & A. Elements of Mechanics. London, W. & R. Matter and Motion. New York, D. Van Nostrand Sound. New York, D. Appleton & & Barnard. Light. New York, D. Appleton & Physical Manipulation. Boston
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