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Comments on CW's work on light and on the velocity of electricity. JH's ruminations lead him to the idea of motion pictures.
Arranges a meeting with CW and Edward Sabine to prepare a report on magnetic proposals.
Arranges a meeting with CW and Edward Sabine to discuss Kew [magnetic] observations.
Sends CW a specimen of JH's 'mercurial photographic process.' JH is pleased that W. H. Fox Talbot received the Rumford medal.