Letter from [Frank Watson] Dyson, Royal Observatory, Greenwich, London, S.E, to Mr [Robert] Harrison, [Royal Society] Wishes to obtain a photograph ofthe picture of [James] Bradley at the Royal Society for comparison with the one at the Observatory. States Sir [Joseph] Larmor sanctioned his request, asking when is the most convenient time for Mr Melotte of the Royal Observatory to come to take the photograph. 15 November 1911