Letter from [Alan Archibald Campbell] Swinton, to Thomas Martins [Esquire], Secretary, The Institute of Physics Responds to a previous letter and informs of his present ill health which is preventing him from taking on new duties. As the meetings of the Advisory Committee on the Preservation of Physical Apparatus of Historical Importance are infrequent, and as the subject interest him, he is prepared to serve on the Committee. 15 October 1928