Richard Hodgson pursues claim to invention of the diagonal solar eyepiece while claiming that JH disclaimed the invention.
Richard Hodgson pursues claim to invention of the diagonal solar eyepiece while claiming that JH disclaimed the invention.
Compares JH's equation for lens curvature with that of C. F. Gauss.
Tests several possible rules for curving lenses including W. L. Newman's and [Thomas] Cooke's. Tries to put W. L. Newman's rules for lens thickness-to-curvature ratios in a simpler equation.
Asks if JH still considering editing William Herschel's R.S.P.T. publications. Suggests that Alexander Herschel edit the work. Speculates that William Herschel observed the 'willow leaves.' JH's star catalogue will be printed by the R.A.S.
Reports on progress of the three Herschel sons at Clapham. Asks JH's advice on his plan to construct a telescope. Looks forward to visit from JH.
Looking forward to visit to Collingwood.
Gratitude for JH's gift of Caroline Herschel's autograph manuscripts to R.A.S.
Writes to JH to propose hiring JH's son Alexander for a year to work in CP's laboratory and make observations in CP's observatory.