BRAVAIS, (AUGUSTE). - INTRODUCING "BRAVAIS LATTICE"

Sur les propriétés géométriques des assemblages de points régulièrement distribués dans l'éspace.

(Paris, Bachelier), 1848 4to. No wrappers. In "Comptes rendus hebdomadaires des séances de l’Académie des sciences", Vol. 27, No 24. Pp. (593-) 616. (Entire issue offered). Bravais' paper: pp. 601-604.

Frst appearance of a landmark paper in crystallography and mathematics as Bravais here begins his rechearches of the rotations and translations of crystals into themselves, and he thereby, in this process, advanced the studies of both crystalline structure and of group theory.

"Bravais Lattice is a type of spatial crystal lattice first described by the French scientist A. Bravais in 1848. Bravais expressed the hypothesis that spatial crystal lattices are constructed of regularly spaced node-points (where the atoms are located) that can be obtained by repeating a given point by means of parallel transpositions (translations). When straight lines and planes are constructed through these points, the spatial lattice becomes divided into equal parallelepipeds (cells). There are a total of 14 types of such lattices, by which the structure of any crystal can be described in the first approximation."(The Free Dictionary).

Parkinson "Breakthroughs" 1848 C/M.

Order-nr.: 47229