. The Bell System technical journal . Fig. 21—Illustrating the cubic lattice. Commence with the plane containing BCD, normal to the directionAE which is one of the principal diagonals of the cube. We wish asymbol for this plane that shall describe its orientation, which is itsimportant feature,—a symbol that shall denote not only the planeBCD, but equally all those which are parallel to it, such as FGHand the parallel planes through A and E and other unit cells. Wemight use the three direction-cosines of the normal to this familyof planes; or we might use the three intercepts of BCD on the thr
. The Bell System technical journal . Fig. 21—Illustrating the cubic lattice. Commence with the plane containing BCD, normal to the directionAE which is one of the principal diagonals of the cube. We wish asymbol for this plane that shall describe its orientation, which is itsimportant feature,—a symbol that shall denote not only the planeBCD, but equally all those which are parallel to it, such as FGHand the parallel planes through A and E and other unit cells. Wemight use the three direction-cosines of the normal to this familyof planes; or we might use the three intercepts of BCD on the threecoordinate-axes, multiplied by an arbitrary factor to convert theminto convenient integers and show that we are not more concernedwith BCD than with any other member of the family; or we mightuse the reciprocals of these three intercepts, also multiplied by someconvenient arbitrary factors. The last choice is the standard three intercepts are a, a, a; their reciprocals are \Ja, 1/a, 1/a;we multiply these by a and obtain
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
