. Optical projection : a treatise on the use of the lantern in exhibition and scientific demonstration. Fig. 211 Fig. 212 225. Convection Currents.—The simplest apparatus forprojecting currents produced by the lowering of specificgravity, is a mere test-tube held in a Bunsen holder andheated as in fig. the tube be flattened,the effect will be betterstill; or a flattened flaskcan be similarly pro-jected. To make thecurrents more visible, afew particles of exceed-ingly fine sawdust fromheavy wood may beplaced in the water, orparticles of blotting-paper rubbed up in a mortar with water ; M
. Optical projection : a treatise on the use of the lantern in exhibition and scientific demonstration. Fig. 211 Fig. 212 225. Convection Currents.—The simplest apparatus forprojecting currents produced by the lowering of specificgravity, is a mere test-tube held in a Bunsen holder andheated as in fig. the tube be flattened,the effect will be betterstill; or a flattened flaskcan be similarly pro-jected. To make thecurrents more visible, afew particles of exceed-ingly fine sawdust fromheavy wood may beplaced in the water, orparticles of blotting-paper rubbed up in a mortar with water ; Mr. H. Gr. Madanuses a crystal or two of magenta coated with gum-water and cc 2
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Keywords: ., bookauthorwrightle, bookcentury1900, bookdecade1900, bookyear1906
