In a recent paper,1 the writers have presented a technique for the construction of models illustrating both the arrangement and the packing of atoms in crystals. Models of some sixty-odd crystal structure types have been constructed by the methods discussed. In most of the structure types, the positions of the atoms are sufficiently general to require a very considerable expenditure of effort in the several calculations necessary before an acceptable model can be constructed. The present paper gives the results of such calculations as have been made to date for certain simple structures. A later paper will present data for more complex structures.2 Those wishing to duplicate such models may utilize the data herewith presented and proceed with the construction without further calculation.

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