Is much obliged for the loan of G. B. Amici's micrometer. Comments on some of his readings with it. Is sorry to hear of the ill-health of Lady Herschel.
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The Sir John Herschel Collection
The preparation of the print Calendar of the Correspondence of Sir John Herschel (Michael J. Crowe ed., David R. Dyck and James J. Kevin assoc. eds, Cambridge, England: Cambridge Univ. Press, 1998, viii + 828 pp) which was funded by the National Science Foundation, took ten years. It was accomplished by a team of seventeen professors, visiting scholars, graduate students, advanced undergraduates, and staff working at the University of Notre Dame.
The first online version of Calendar was created in 2009 by Dr Marvin Bolt and Steven Lucy, working at the Webster Institute of the Adler Planetarium, and it is that data that has now been reformatted for incorporation into Ɛpsilon.
Further information about Herschel, his correspondence, and the editorial method is available online here: http://historydb.adlerplanetarium.org/herschel/?p=intro
No texts of Herschel’s letters are currently available through Ɛpsilon.
Is much obliged for the loan of G. B. Amici's micrometer. Comments on some of his readings with it. Is sorry to hear of the ill-health of Lady Herschel.
Would he look at the accompanying work by O. P. A. P. Dufrénoy. Feels that Dufrénoy would advocate only that which was right.
Sending an equation for JH to solve. Thanks for sending details of the weight of the florin, and the song from Punch. If he wishes JH may borrow books from the College library.
Sending one of his equations for JH's comments.
Sending a comic squib.
Requests donation of copy of JH's Cape Results to library of Mechanics Institution.
Acknowledges receipt of JH's Cape Results for library of Mechanics Institution.
LC, from Parma [Italy], and Baron de Lutteroth wish to visit Royal Mint and meet JH. [JH annotation of 27 Aug.: Ordered Smith, Elder & Co. to give copy of JH's Cape Results to L. Caggiati for delivery to 'Prof. [Cobla Dinester?] of [Royal?] Observatory in Parma.]
Computation of Alpha Centauri's angle and distance, derived with JH's 'graphical method.' Compares this with results by other astronomers.
Heard JH plans new edition of Examples of Finite Differences [1820]. Will send list of errors HW found in original. Results of HW's investigation of self-repeating series of numbers.
Recalls JH's predecessor [Isaac Newton] at Mint was also interested in Bernoulli's 'Isoperimetrical Problems.' HW plans paper on new expression for coefficients of differences of zero in self-repeating series.
Cambridge [Philosophical] Society will publish HW's paper on self-repeating series. Suggests JH clarify some equations in new edition of [Examples of Finite Differences (1820)].
Additional suggestions for improving clarity of equations in new edition of JH's [Examples of Finite Differences (1820)].
Additional improvements for new edition of JH's [Examples of Finite Differences (1820)].
Further discussion of need for two constants [see HW's 1854-[5]-11]. Sends first installment of errata HW found in JH's [Examples of Finite Differences (1820)]. Realizes JH's duties [at Mint] afford little time to publish new edition. Suggests printing only errata list to first edition.
Sends copy of HW's paper, with manuscript listing properties of differences of zero. Is there a published table of such differences like that in JH's [Examples of Finite Differences (1820)]?
Learned to simplify expression for Bernoulli's number B=2n+1 using JH's formula.
Offers improved version of formulas sent in previous letter.
Happy that JH may be leaving Mint and returning to scientific pursuits. HW resumed work on equations in finite differences. Hopes to reconcile discrepancy between JH's and P. S. Laplace's solutions. JH's solution renders only particular, not general, solutions.
Approves of JH sharing HW's findings. HW on excellent terms with Augustus De Morgan. Suspects two integrals exist, one real and one imaginary, for P. S. Laplace's equation.