From:
Sir John Herschel
To:
George Biddell Airy
Date:
[25 September 1843]
Source of text:
RGO 6.701.106
Summary:
Gives formula for defining the measure of the scale of an actinometer.
Contributor:
John Herschel Project
Showing 1–6 of 6 items
Gives formula for defining the measure of the scale of an actinometer.
Regarding custody of the Standards.
Makes some suggestions about possible storage places for the United States' standards [see GA's 1843-9-9].
Describes some available glass discs, which might do for making lenses for a large refracting telescope [see GA's 1843-8-30].
Regarding the storage of the Standard weights and measures.
Requires information on an actinometer.