Handy man's workshop and laboratory . lass number one at the lower end of the gutter, butthrow an ignited match into the latter glass and a blue flame willfill it for one or two seconds. A little apparatus, called the four liquids vial, is generallyshown to students during a course in elementary physics. Mer-cury, a solution of potassium carbonate, alcohol, and petroleumare seen to superpose themselves in one vessel according to theirrelative densities, the surface of separation being in each case 208 HANDY MANS WORKSHOP AND LABORATORY horizontal. This is the way in which non-miscible liquids
Handy man's workshop and laboratory . lass number one at the lower end of the gutter, butthrow an ignited match into the latter glass and a blue flame willfill it for one or two seconds. A little apparatus, called the four liquids vial, is generallyshown to students during a course in elementary physics. Mer-cury, a solution of potassium carbonate, alcohol, and petroleumare seen to superpose themselves in one vessel according to theirrelative densities, the surface of separation being in each case 208 HANDY MANS WORKSHOP AND LABORATORY horizontal. This is the way in which non-miscible liquids gen-erally arrange themselves when thrown together in one disulphide permits of a somewhat different arrangement,which appears very odd because the conditions of its realizationare so unusual. It happens that carbon disulphide and glycerincannot be mixed, and have exactly the same density () upto the second decimal, the third decimal being variously influ-enced by the purity and temperature of both chemicals. If the. Fig. 184—Pouring invisible vapor of carbon disulphide downa trough and into a glass two liquids be placed with some care side by side in one vessel,the adhesion of glycerin for glass wiil keep them in that queerposition. Take an ordinary glass, and divide its capacity into two halvesby means of a roughly-cut pasteboard partition laid vertically inthe glass. Pour at the same time glycerin on one side of thepartition and carbon disulphide on the other. If, while so doing,you are careful not to allow too great a difference of level betweenboth liquids, each will stay on its own side of the partition, everi HANDY MAN S WORKSHOP AND LABORATORY 209 though the latter may imperfectly fit the glass. Now raise thepartition. The surface of separation of the two liquids sometimesremains perfectly vertical for several minutes. More frequently,
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