. The Bell System technical journal . P,-* Fig. 37 Fig. 38 Fig. 37—The (0, 0, 0) position of a shop system of direction 3i8—The second position of a shop system. From () we see that P = rx and hence, if this is to be the same platethe designer specified by P = Rx we must have R — r whence we mayequate the terms of () and () to get the relations or MATHEMATICS OF PHYSICAL PROPERTIES OF CRYSTALS 17 COS U2 = COS ^ or ^2 = zL 6 tan f/i = cot lA () tan Us = cot Ui = yp -90 + nir U2= e Uz = -90 + nir

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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1