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Pole, William in correspondent 
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From:
Sir William Pole
To:
Sir John Herschel
Date:
[12 November 1856]
Source of text:
RS:HS 14.19
Summary:

Gives particulars of his vision, which WP characterizes as di-chromic. Recounts experiments with red glass sent by JH to WP. Offers to visit if JH wants personal interview.

Contributor:
John Herschel Project
From:
Sir William Pole
To:
Sir John Herschel
Date:
[17 November 1856]
Source of text:
RS:HS 14.20
Summary:

Thanks JH for note explaining colored glasses and 'positive' colors, saying WP only had a chance to do experiments with 'negative' colors thus far. Accepts JH's invitation to visit.

Contributor:
John Herschel Project