Copy letter from Herbert Rix, to Dr John Ambrose Fleming 'Dear Sir, I find that the lantern will be required for another paper next Thursday, which makes it all the more desirable that you should call here as soon as possible and show me precisely what arrangements you require, so that the arrangements for the two papers should not clash. Yours faithfully, H Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 2 January 1890