[by] W. Trinks and M. H. Mawhinney. by H. Bennett and W. G. Hawley. by W. T. Elwell and J. A. F. Gidley. by P. W. Abeles and F. H. Turner. by W. H. Besant and A. S. Ramsey. by N. F. Mott and H. S. W. Massey.