Letter from Balfour Stewart, Kew Observatory to Edward Sabine Includes Mr Adie’s charge for the self-recording instruments. Stewart nor Mr Adie have received word of the safe arrival of Mr [Adolph Theodor] Kupffer’s instruments. Stewart notes the following part of his letter should be considered ‘private’. Regarding Professor [Peter Guthrie] Tait and the movement of the earth. Discusses ‘experiments on a ? in rapid rotation’ and its results. 29 December 1863