Papers regarding image tubes:
A copy of a letter from E.A. Beaver, University of California, to J.D. McGee, Imperial College, giving corrections to a symposia paper and making comments on diode arrays and foils, 1972.
A letter from B.L. Morgan of Imperial College regarding the scattering of electrons in image tubes, including a drawing of a Spectracon end window and diode array, 1972.
A memorandum from D. McMullan, Imperial College on silicon diode array image tubes, incorporating a research grant application, 1972.
A memorandum from J.W. Gietzen on project organisation within the Royal Greenwich Observatory, 1972.
A circular letter from J.A. Westphal of the California Institute of Technology on R.G.A. image tubes, with advertising circulars for image tubes from General Electric, 1973.