Letter from Robert Hunt, Liverpool to Professor [John] Phillips Hunt refers to the ‘obstacles in the way of using the actinograph at Kew’ and therefore has ‘abandoned’ the instrument. [Francis] Ronalds used the actinograph’s clock work for his own photographic registrations. [William Radcliffe] Birt would like to make observations on the ‘chemical changes of solar light’ which Hunt notes will be most interesting, but asks Sabine ‘how am I to act?’. 17 November 1849