Zone d'identification
Cote
Add. MS a/207/8
Titre
Letter from John Herschel
Date(s)
- [1 Oct. 1823] (Production)
Niveau de description
Pièce
Étendue matérielle et support
3 pp
Zone du contexte
Nom du producteur
Histoire archivistique
Source immédiate d'acquisition ou de transfert
Zone du contenu et de la structure
Portée et contenu
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'.