This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 edition. Excerpt: ...rubidium, and caesium--that structure is similar for all the members of the series, the same type of space-lattice being present in all. Hence, the units of these space-lattices of the various salts of the series, the elementary parallelepipeda, will be fairly and truly comparable with each other. ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 edition. Excerpt: ...rubidium, and caesium--that structure is similar for all the members of the series, the same type of space-lattice being present in all. Hence, the units of these space-lattices of the various salts of the series, the elementary parallelepipeda, will be fairly and truly comparable with each other. Whether those of other less exclusive members of the isomorphous series, such as the salts containing ammonium and thallium, are also equally comparable is a matter for discussion, which will be referred to later. But we are on uncontrovertibly safe ground when we accept it as a fact that the space-lattices of the structures of the potassium, rubidium, and caesium members of the series are constructed on the same plan, and that the elementary parallelepipeda, the molecular structural units, are of similar shape and character, and differ only in their absolute and relative dimensions. But any comparison of the members of different series is as yet a matter for the future, although there are indications that we are approaching the time when such will be possible by the introduction of an additional correlating factor, beyond the known factors which we shall now proceed to discuss. From the foregoing it will at once be obvious that the crystallographic axial ratios do not afford us the desired comparative dimensions of the structural-unit parallelepipeda. But they do afford us the relations of the three space dimensions for that one substance for which they were calculated, and it will be obvious that if there were some other factor available which would give us the relations of the volumes of the parallelepipeda of the several salts of the series, we could derive the three relative spacial dimensions by combining the two factors. Such a volume...
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