Letter from S Rosenbaum, 17 Park Lane, Clissold Park, to Charles Vernon Boys, London The kindness of Boys in answering Rosenbaum's questions as a representative of 'The Electrician' after the Royal Institution lecture prompts him to write on another matter. Rosenbaum is collecting works on the weight of the Earth and asks to be loaned copies of Boys's papers. He recalls hearing Boys lecture in Manchester on the topic and exhibiting some excellent photographs. A popular paper with some of these would be ideal and he promises to acknowledge Boys's work. 30 April 1900