Search: 1850-1859 in date 
Knowles, Francis Charles in addressee 
Sorted by:

Showing 1–2 of 2 items

Herschel11615

From:
Sir John Herschel
To:
Francis Charles Knowles
Date:
[16 October 1856]
Source of text:
RS:HS 23.182
Summary:

Thinks that aluminum coating on telescope mirrors may work [see FK's 1856-10-9]; also suggests looking into flouric glass containing aluminum for lenses of low dispersion power.

Contributor:
John Herschel Project

Herschel11177

From:
Sir John Herschel
To:
Francis Charles Knowles
Date:
[6 December 1856]
Source of text:
RS:HS 11.67 & 23.184
Summary:

Would be inclined to try a combination of cryolite and silex to obtain a glass. Comments on his process for decomposing alumina by cyanide of sodium. Sorry to see that FK uses the current forms of chemical notation.

Contributor:
John Herschel Project
Author
Addressee
Correspondent
Date
Document type
Contributor
Transcription available