Capitolo 39
"To August 1821 I copied out a M.S. on Optics, I think from Mr
Whewell: August 24 one on the Figure of the Earth and Tides; and
to of the other duration one on the motion of a circle of body two centers of
strength; both from Mr Whewell. On my paper that scribbles me I find--A problem
on the vibrations of a gig as depending on the footstep of the horse (likes that
of a pendulum whose support is disturbed), the Attractions of Maclaurin,
Effect to separate the lenses of an achromatic object-glass
(suggested by my old telescope), the theory of Barlow of numbers, and
division of the circle in 17 parts, partial differentials, theory of
eye-pieces, epicycloids, Figure of the Earth Time of body in arc of
parable, Problem of Sound Tides, Refraction of Lens included
bigness, & the c., the Ivory paper on Equations, Achromatism of microscope,
The capillary attraction, Motions of Fluids, the principal axes of Euler,
Spherical pendulum, Equation b squared(d squaredy/dx squared)=(d squaredy/dts squared), barometer, Lunar
Theory worked well, differential equations and to the agenda, Calculation of
Variations, the Interpolations as Laplace for Comets, Kepler
theorem. In September I had my old telescope it climbed on on a short tripod
standing coop, and it made experiments on his/her rectifications. I was possessed of
White's Ephemeris, and I find observations of Jupiter and Saturn in
October. I planned a motor to describe ellipsis from the polar one
equation A/(1 + theta of cos of and) and it tried to make a micrometer with silk
you spin that converge to a point. Mr Cubitt called on Oct. 4 and Nov. 1;
he was taken part in to erect a grindstone from torture to Gaol in Cambridge, and it had some
thoughts to send plain for the observatory in Cambridge, the erection
of what you/he/she was proposed then. On Nov. 19 that I find that I had received from
Cubitt a Nautical Almanac, the first one that I had. On Dec. 11 that I have done
of the experiments with Drinkwater: I think that you/he/she was turning a glass
oil that contains on the water. In Classics I was mainly busy on