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Vallack, B. W. S. in correspondent 
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From:
B. W. S. Vallack
To:
Sir John Herschel
Date:
[18 November 1865]
Source of text:
RS:HS 17.415
Summary:

Comments on George Witt's work on silvering glass mirrors and on JH's Telescope. States problems with his Newtonian telescope. Works on designs for a binocular telescope.

Contributor:
John Herschel Project
From:
B. W. S. Vallack
To:
Sir John Herschel
Date:
[25 January 1866]
Source of text:
RS:HS 17.416
Summary:

Thanks JH for corrections to the mirrors of his telescope. Says the telescope finally gives 'a satisfactory view of Saturn.' Discusses the lenses for BV's binocular telescope. Thinks photography could benefit from binocular vision.

Contributor:
John Herschel Project
From:
B. W. S. Vallack
To:
Sir John Herschel
Date:
[12 February 1866]
Source of text:
RS:HS 17.417a
Summary:

Responds to JH's criticisms of his binocular telescope plans.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
B. W. S. Vallack
Date:
[16 February 1866]
Source of text:
RS:HS 17.417b (C: RS:HS 24.141)
Summary:

Suggests weaknesses in BV's plans for a binocular telescope.

Contributor:
John Herschel Project