Figure 26.1.2.4

Blake, C. C. F.; Fenn, R. H.; Johnson, L. N.; Koenig, D. F.; Mair, G. A.; North, A. C. T.; Oldham, J. W. H.; Phillips, D. C.; Poljak, R. J.; Sarma, V. R.; Vernon, C. A.

doi:10.1107/97809553602060000725

International
Tables for
Crystallography
Volume F
Crystallography of biological macromolecules
Edited by M. G. Rossmann and E. Arnold

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International Tables for Crystallography (2006). Vol. F. ch. 26.1, p. 748 | 1 | 2 |

Figure 26.1.2.4

C. C. F. Blake,^a ^‡ R. H. Fenn,^a ^§ L. N. Johnson,^a ^*^¶ D. F. Koenig,^a ^‡‡ G. A. Mair,^a ^‡‡ A. C. T. North,^a ^§§ J. W. H. Oldham,^a ^¶¶ D. C. Phillips,^a ^¶¶ R. J. Poljak,^a ^‡‡‡ V. R. Sarma^a ^§§§ and C. A. Vernon^b ^¶¶

^a Davy Faraday Research Laboratory, The Royal Institution, London W1X 4BS, England, and ^bDepartment of Chemistry, University College London, Gower Street, London WC1E 6BT, England
Correspondence e-mail: louise@biop.ox.ac.uk

Figure 26.1.2.4

Reciprocal-space diagrams showing the direction of the incident X-ray beam, the Ewald sphere and the genesis of a reflection (a) in an equatorial plane and (b) in the equi-inclination setting. Principal reciprocal-lattice directions are shown as thick lines. They also represent the slides in the diffractometer. The rotation of the diffractometer slide system about the axis C′OC is coupled to the rotation of the crystal about the axis R′XR by gears, pulleys and steel tapes. The counter arm of the diffractometer is represented by the fixed link XP = XO. Reproduced with permission from Arndt & Phillips (1961). Copyright (1961) International Union of Crystallography.