sible particle cules are in various stages of disintegration. the working chamber, the other in the superintendent’s of a chemical substance is understood. For example, The “ultra microscope,” invented by Siedentopf and booth on the platform of the caisson. Zsigmondy, has made it possible to… … than 35 feet in diameter and 10 feet wide at the rim. tions, which consist of metals and other insoluble sub- The thickness of the rim is about 12 inches and is con- stances, in a state of extremely fine subdivision, held in stituted of 44 thicknesses of beech planks with stag- suspension by water…
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