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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.
Too ill to attend a demonstration by CW of one of CW's instruments [?].
Postpones visit of Lady [Margaret] Herschel to CW. Wishes to take CW's Symphonion to Slough. Has made favorable mention of CW's tuning fork experiments in paper on absorption [JH's 'On the Absorption of Light by Coloured Media...'].
Invites CW to Slough to demonstrate CW's 'elegant experiments on light & sound.' Will need time to get JH's electric machine in order. Asks for copy of CW's paper on Jew's harp.
Accepts JH's invitation to demonstrate [on 28 Aug.] CW's portable optical and acoustical experiments and the 'whirling machine.' Asks JH to supply 'an electrical machine and a good sized jar.' Encloses copy of CW's paper on Jew's harp. Will bring another paper and new 'Symphonion' for Mary Herschel.
Returns Mary Herschel's repaired concertina. Sends CW's recent paper on velocity of electricity [R.S.P.T. 124 (1834)]. Electrical experiments CW is planning. Appointed professor of experimental philosophy at King's College.
Invites JH to Kew Green to see Francis Bauer's plates etched by J. N. Niepce's photographic process. Perhaps L. J. M. Daguerre assumes more credit than is due. Heard Niepce visited London in 1826, but his paper was rejected by R.S.L. at W. H. Wollaston's urging.