Correspondence with W.M. Hutchings of the 'Colliery Guardian', 1874-1877, concerning the engraving and publication of a map and article on magnetic declination, including a 'Map showing the magnetic declination for 1874, England and Wales', printed as a supplement to the 'Colliery Guardian', 1874; and a 'Map showing lines of equal magnetic declination for 1877' from the 'Colliery Guardian', 29 December 1876.

Copies of articles on magnetic disturbances by William Ellis sent to 'Nature' for publication, 1878-1886.

Copies of the 'Colliery Guardian', 19 May, 2 June and 9 June 1882, including articles by Royal Observatory staff on magnetic disturbances, with related correspondence, 1882-1886.

Miscellaneous enquiries from individuals and institutions and requests for copies of magnetic observations, 1873-1893. The correspondents are G.E. Preece, J.D. Hardy, E. Quetelet, M. Hall, A. Edwards, F.A. Howlett, B.J. Hopkins, J.E. Clark, J.A. Bower, F.J. Marston, G.Y. Symons, W.H. Reece, G. Bensted, J. Williams, A. Nutt, J. Cundill, R.H. Scott, R. Shettle, L.F. Bayliff, Sir G. Stokes, A.J.S. Adams, A. Lugli, A.W. Rücker, 'Colliery Guardian', the Weather Bureau of the U.S. Department of Agriculture, Professor Helliman, Dr Neumayer, H. Goodyear, P.J. Denza, Captain Lecky and A. Hubner.