Internal memoranda and plans for the New Magnetic Pavilion at the Royal Observatory covering the design and the building itself and including some magnetic observations, 1896.

Memoranda and instructions to staff of the Meteorological and Magnetical Department, including various diagrams and tables and magnetic observations, 1845-1903.

Miscellaneous correspondence concerning the following subjects, 1873-1892: 1. Conversion of scales; 2. Notes; 3. Aurora of 2 October 1882; 4. A magnetic disturbance; 5. Magnetism of bricks; 6. Treatment of magnetic results; 7. Units of Greenwich measurement; 8. Horizontal force, 1883; 9. Declinations, 1874; 10. Harmonic analysis, 1884; 11. Lassell Dome iron gutters; 12. Magnetic perturbations; 13. Temperature correction of magnets; 14. Defection observations; 15. Change of declination, 1841-1889; 16. Dip photo registers; and 17. Simultaneity of magnetic storms.