Letter from [Richard Tetley] Glazebrook, The National Physical Laboratory, Bushy House, Teddington, Middlesex, to [Robert William Frederick] Harrison, The Royal Society 'Dear Sir, The slides illustrating Mr F E SMith's paper recently read before the Royal Society are accidentally left behind at Burlington House. If you can trace these I should be much obliged if you would have them returned to us. Yours faithfully, R T Glazebrook, Director [?] FRS.' 15 July 1904