From:
John Welsh
To:
Sir John Herschel
Date:
[15 July 1856]
Source of text:
RS:HS 18.139
Summary:
Describes R.S.L.'s compound magnet. Recommends cleaning and remagnetizing. Awaits JH's instructions.
Contributor:
John Herschel Project
Showing 1–3 of 3 items
Describes R.S.L.'s compound magnet. Recommends cleaning and remagnetizing. Awaits JH's instructions.
Reliability of barometer and thermometer measurements from balloons. Compares results of several European observers. Suggests new expedition to Teneriffe [Canary Islands].
Cannot answer JH's question about electricity in heavy showers. Observations were discontinued years ago. Refers to Francis Ronalds's past experiments. Cites 1849 B.A.A.S. Rep. for map of storm observations. Notes changes in polarity of electricity during storms.