Zone d'identification
Cote
Add. MS a/200/168
Titre
Letter from George Airy
Date(s)
- 15 Mar. 1861 (Production)
Niveau de description
Pièce
Étendue matérielle et support
2 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
GA has fallen behind in his official observatory work: 'I have to work well in order to bring it to a respectable state'. He has been going through the Horizontal Magnetic Forces from ten years photographic self-registration, and has found that 'twice in every lunar day, the needles N.pole is drawn vertically, and twice returns easterly. But the vertically is not true W. but, as far as our numbers can be trusted, about 20 [degrees] N. of W. It may be, among these small quantities that there is sufficient uncertainty to allow us to take the direction as truly W.'
