Notice from C.F. Varley giving a change of address, 1874.

Correspondence with Diamilla Muller, Italy, concerning the title and publishers of a work by Sir George Airy, 1874.

Correspondence with W. Bond-Paul regarding terrestrial magnetism, 1875, including an unlabelled diagram and a letter from [W.R.A.] titled 'A concise statement of two distinct hypotheses relative to the variation and dip of the needle'.

Correspondence with the Revd S.J. Perry concerning the probable effect of water pipes on a magnet and correspondence with A.P. Skene. 1876.

Correspondence with General Sir J.H. Lefroy, 1877-1878, enclosing a printed letter to R. Scott from M. Wÿkanda of the Swedish Spitzbergen Expedition to be inserted in 'Magnetic Observations at Lake Athabasca'.

Correspondence with E.M. Edmond requesting information on a work by Sir George Airy, 1878.

Letter from [F.A.] Driscoll concerning his theory of the cause of magnetic variation, 1878.

Correspondence with the Revd J. Paul concerning the connection between magnetic variations and the hour of the day, 1879.

Correspondence with C.A. Leveridge requesting a copy of a work by Sir George Airy, 1880.

Printed report, in French, of the meeting of the 'Congres International de Meteorologie' in Rome, 22 April 1879.

Internal memorandum concerning the publication of a new edition of a magnetic map by the 'Colliery Guardian', 1880.

Cutting from the 'New York Times' of an article by F.H. Bigelow titled 'The Sun like a magnet' [1892].

Correspondence with J. Nowack of the 'Weather Plant Observatory' concerning magnetic and electrical disturbances, 1893.

Letter from Thomas and Taylor, civil engineers, requesting information on variations of the magnetic meridian, 1894.

Correspondence with L.A. Bauer concerning his intention to found a journal, 'Terrestrial Magnetism', and his hope to enlist the support of Royal Observatory, 1895.

Request from F.C. Penrose to visit the Royal Observatory and check his compass, 1896.

Correspondence with the Meteorologisches Institut, Berlin W., concerning the building of electric railways near Potsdam and the probable harmful effects on the magnetic instruments, 1898.

Letter from H.W. Pearson, 1898, concerning an observation by Peter Adeiger as to the declination of the Needle in 1269.

Paper on pseudo-scientific beliefs by J.W. Atkinson, who claims to be in direct communication with the Almighty, c. 1872.

Correspondence with D.Y. Cliff, South Africa, concerning queries on magnetism, most of which are illegible, 1900.

Note titled 'Antarctic Expedition 1901', 1900.

Correspondence with G. Sack, Lübeck, acknowledging receipt of two copies of his paper on the daily variations of magnetic inclination and intensity, 1901.

Correspondence with A. Lupton, Leeds, concerning an enquiry about magnetic experiments, 1901.

Printed circulars from the Comité International Meteorologique, 1900-1903.

Printed circulars from the Commission International de Magnetisme Terrestre and correspondence, 1903-1906.

Correspondence with A. Schmidt, Bureau Executif de la Commission International du Magnetisme Terrestre and Dr Maurits Snellen, Apeldoorn, 1906-1908.

'Caractere Magnetique, de chaque jour des mois, Octobre-Decembre 1907', 1908.

Magnetic observations, 1908-1912.