Papers relating to D.H. Sadler's miscellaneous investigations, including, among other items, 'Astrometric Ephemeris of Pluto'; a note on the use of the equinox for the preceding or nearest year; papers relating to ephemerides of minor planets; 'Demonstration of Hollerith Machines'; material on P.Z.T. (Photographic Zenith Tube) Stars, 1950; J.G. Porter, 'The Orbit of a Meteor Stream'; Sadler, 'The Work of the Nautical Almanac Office' and 'Interpolation of the Lunar Ephemeris at Daily Intervals'; and G.A. Wilkins, 'Future Work of N.A.O. Division II', 1965.