, Ivory's paper on Equations, Achromatism of microscope,
Capillary Attraction, Motions of Fluids, Euler's principal axes,
Spherical pendulum, Equation b squared(d squaredy/dx squared)=(d squaredy/dt squared), barometer, Lunar
Theory well worked out, ordinary differential equations, Calculus of
Variations, Interpolations like Laplace's for Comets, Kepler's
theorem. In September I had my old telescope mounted on a short tripod
stand, and made experiments on its adjustments. I was possessed of
White's Ephemeris, and I find observations of Jupiter and Saturn in
October. I planned an engine for describing ellipses by the polar
equation A/(1 + e cos theta) and tried to make a micrometer with silk
threads converging to a point. Mr Cubitt called on Oct. 4 and Nov. 1;
he was engaged in erecting a treadmill at Cambridge Gaol, and had some
thoughts of sending plans for the Cambridge Observatory, the erection
of which was then proposed. On Nov. 19 I find that I had received from
Cubitt a Nautical Almanac, the first that I had. On Dec. 11 I made
some experiments with Drinkwater: I think it was whirling a glass
containing oil on water. In Classics I was chiefly engaged upon
Thucydides and Homer. On October 6th I had a letter from Charles
Musgrave, introducing Challis, who succeeded me in the Cambridge
Observatory in 1836.
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