Identificatie
referentie code
Add. MS a/204/8
Titel
James David Forbes to George Peacock
Datum(s)
- 10 Nov. 1832 (Vervaardig)
Beschrijvingsniveau
Stuk
Omvang en medium
3 pp
Context
Naam van de archiefvormer
archiefbewaarplaats
Geschiedenis van het archief
Directe bron van verwerving of overbrenging
Inhoud en structuur
Bereik en inhoud
Geneva - Thanks GP for all his suggestions prior to his trip abroad. The letters Lord Palmerston favoured him with have been most useful - especially in avoiding the Prussian custom house. He has been taking many observations in the Alps with his Magnetic and Meteorological apparatus: concentrating on magnetic intensity at heights. To eliminate the effect of temperature on his results he has been conducting experiments on the needles in question at different temperatures. Using John Herschel's actinometer he has taken observations - 'at stations separated by a vertical column of 6500 feet of air' - to determine the loss of force of the solar rays in passing through the atmosphere. Sends his regards to WW and George Airy.