Copy letter from Robert William Frederick Harrison to E Matthey 'Replying to your letter of January 4, I think there can be no objection to my informing you of the signatories to your certificate. They are as follows: Sir Wm Crookes, Lord Rayleigh, Sir A Noble, Sir J Dewar, Prof W E Ayrton, Sir A Rucker, Sir J Crichton-Browne, Sir W H Broadbetn, Sir N Lockyer, J W Judd, Prof G D Liveing, Sir J W Swan, J E Reynolds, J A Ewing.' 8 January 1912