From:
John Tyndall
To:
Annette Roche
Date:
20th, Sep, 1864
Source of text:
MS JT/1/TYP/11/3852, RI
Summary:
No summary available.
Contributor:
Tyndall Project
Showing 41–60 of 74 items
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Is not 'at liberty' to speak of experiments on change of refrangibility of 'extra-red' rays. Discusses other experiments on extra-red regions, having used various prisms but not obtaining JH's results.
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JT does not have 'luxury' of using sunshine; uses electric light. Perhaps this adds to inability to obtain heat spots [see JH's 1864-11-16].
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