Letter from John P [Peter] Gassiot, Clapham Common, to Dr [William] Sharpey, Secretary of the Royal Society Providing an extract of a memorandum read by Mr Welsh at the last meeting of the Kew Committee of the British Association. The memorandum relates to the state of the mechanical department of the Kew Observatory and lists tools that would be of use to the observatory's work. 8 December 1857