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Knowles, Francis Charles in addressee 
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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
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
From:
Sir John Herschel
To:
Francis Charles Knowles
Date:
[23 April 1866]
Source of text:
RS:HS 24.154
Summary:

In response to FK's 1866-4-17, JH says that he knows nothing about screw propulsion in ships and so cannot comment on FK's paper.

Contributor:
John Herschel Project