Zone d'identification
Cote
Add. MS a/200/107
Titre
Letter from George Airy
Date(s)
- 29 Nov. 1854 (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
Royal Observatory Greenwich - GA's 'people have brought up the pendulum-calculations to the final stage, and the result is - 1. The pendulums have stood so well as to give very great confidence in the accuracy of result. 2. The gravity at the bottom of the mine (reputed 1260 feet) is greater than at the top by 1/19190 part...This gives density nearly = 2.7 x density of coal measures, which is more than I expected'.