Calendar: 1972-1973 Page 503

Annual Report of the Delegacy cxxi Newman Ε and Young Ά new approach to the equations of motion of pole-dipole particle Math Phys December 1970 Pirani 'Noncausal behaviour of classical tachyons Physical Review 3224- 1970 RaoJ 'Radiating Levi-Civita metric' Phys Α 17-20 1971 Tims and Tyrrell 'Approximate evaluation of Euler's constant Math Gazette 33 65-7 1971 Tyrrell with Reeve 'The surface of S4 generated by the rational normal quartic curves which touch four given lines London Math Soc 1-6 1971 with Powell Μ Τ Ά theorem in circle geometry Bull London Math Soc 70-74 1971 Reviews in Zentralblatt fiir Mathematik Bull London Math Soc and Math Spectrum DEPARTMENT OF PHYSICS Barr 'The attenuation of and radio waves propagating below inhomogeneous isotropic ionospheres of Atmos and Terr Physics 32 1781 1970 'The propagation of and radio waves beneath an inhomo- geneous anisotropic ionosphere of Atmos and Terr Physics 33 343 1971 Clark Ν Burge Smith Α and Dore 'Backward angle scattering of 50 MeV protons from Ο Ν and Be Nuclear Physics A137 145 1970 Collins 'Non cutting applications of man-made diamond Financial Times Survey May 20 26 1971 Collins Lightowlers and Dean 'The role of phonons in the oscillatory photoconductivity spectrum of semiconducting diamond Proc of the Third International Conference on Photoconductivity-Suppl to Physics Chem Solids 323 1971 Collins and Williams 'The nature of the acceptor centre in semiconducting diamond Diamond Research 1971-Suppl to Ind Diamond Review 23 Davies 'No phonon line shapes and crystal strain fields in diamonds Phys 2474 1970 'Aggregation of nitrogen in diamond Nature 228 758 1970 'Impurity nitrogen strain effects on no-phonon lines in diamond Proc