Letter from [William George] Armstrong, Cragside, Rothbury, to [Alan Archibald Campbell] Swinton, 66 Victoria [Street], London, S.W Apologises for not being able to meet Swinton during his present visit to London. He expected the board meeting to be in London and did not discover that it would be held in Newcastle. Enquires when Swinton can next come to Cragside, stating he will let the coil experiments stand until then. Continues to get new results with the dust. 23 November 1892