Search: Herschel, John in correspondent 
Dollond, George in correspondent 
1840-1849::1842 in date 
Herschel, John in author 
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Herschel12722

From:
Sir John Herschel
To:
George Dollond
Date:
[15 December 1842]
Source of text:
TxU:H/L-0137; Reel 1054
Summary:

Sends description and drawings of JH's actinoscope. Requests estimate for time and expense of constructing it. Questions about clock mechanism and prisms.

Contributor:
John Herschel Project

Herschel12723

From:
Sir John Herschel
To:
George Dollond
Date:
[25 December 1842]
Source of text:
TxU:H/L-0138; Reel 1054
Summary:

Regrets that GD cannot build JH's entire actinoscope. If GD can make at least mechanical components, JH will supply optics and clockwork. Can GD complete these [by end of March]? Funds are limited; please estimate cost.

Contributor:
John Herschel Project

Herschel12724

From:
Sir John Herschel
To:
George Dollond
Date:
[29 December 1842]
Source of text:
TxU:H/L-0139; Reel 1054
Summary:

Confirms scale of drawings [for JH's actinoscope]. Has found simple contrivance to replace clockwork. Will order lenses and prisms from Munich; all English glass has color aberrations.

Contributor:
John Herschel Project
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