From:
George Biddell Airy
To:
Sir John Herschel
Date:
[11 June 1853]
Source of text:
RGO 6.339.62a
Summary:
Asks JH to let an examination be made of the standard pound kept at the Royal Mint [see WM's 1853-6-8].
Contributor:
John Herschel Project
Showing 1–2 of 2 items
Asks JH to let an examination be made of the standard pound kept at the Royal Mint [see WM's 1853-6-8].
Describes a method developed by [J. J.] Heilmann of 'taking from glass negatives positive impressions of different dimensions.' Praises JH's suggestion that public records be preserved on microscopic negatives.