Identity area
Reference code
Add. MS a/207/8
Title
Letter from John Herschel
Date(s)
- [1 Oct. 1823] (Creation)
Level of description
Item
Extent and medium
3 pp
Context area
Name of creator
Repository
Archival history
Immediate source of acquisition or transfer
Content and structure area
Scope and content
WW should submit his paper to the Royal Society ['A General Method of Calculating the Angles Made by Any Planes of Crystals, and the Laws According to which They are Formed', Phil. Trans., 1825]: 'Your idea of denoting every possible secondary face by one symbol (p, q, r) where p, q, r may be either + or - is excellent'. Although JH had adopted 'decrements on edges as partcular cases of decrements on angles' he 'did not think of negative decrements, which give your method its generality'.