. The electron microscope, its development, present performance and future possibilities . 0 0 0 (. o Fig. 48. Electron density diagram of NaCl crystal, obtained by W. L. Bragg's method of Fourier analysis from a great number of diffraction photographs. (H. G. Grimm, R. Brill, C. Hermann and CI. Peters, Naturzviss, 26, 479, 1938) * This part was written and figure 47 drawn before I was aware that SchifT "^2 had discussed the problem in almost exactly the same way.

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