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Some Experiences with the Bull Gamma 3BAET Computer
A Digital Mechanical Computer for Fourier Operations
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absolute configuration Acta Cryst amplitudes anisotropic anisotropic vibrations anomalous scatterers approximation asymmetric unit atomic coordinates AUTOCODE axes binary calculated cards centrosymmetric coefficients convergence correct corresponding cosine Cruickshank crystallographic cycle derivatives diagonal drum EDSAC electron density errors Ferranti Ferranti Mark formula Fourier program Fourier series full matrix given heavy atom indices isomorphous isotropic Laboratory least squares machine magnetic drum magnetic tape maximum MERCURY method minimum function molecule monoclinic msec non-centrosymmetric normal equations obtained operations orthorhombic Patterson function peaks Pegasus Pepinsky phase angle plane positions possible problem Ps(u punched reflections routine scale factor scattering factor scheme SFLS program shifts space group space group PI specified speed Stage standard storage structure factors sub-routines superposition symmetry temperature factor three-dimensional trial structure triclinic trigonometric trigonometric functions unit cell values vector weighting words written X-RAC zero