On the basis of some compounds referred to by AS [see 1842-5-10], JH has now developed a new form of photography using gold as a stimulant; JH calls it the 'Argyrotype'.
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On the basis of some compounds referred to by AS [see 1842-5-10], JH has now developed a new form of photography using gold as a stimulant; JH calls it the 'Argyrotype'.
Thanks JH for a copy of a paper on prismatic study of the sun's rays, and for accompanying photographs.
Sends several samples of ferrocyanide JH had requested.
Has been trying to make other metallo-cyanides at JH's request, but without success.
Note accompanying a sample of iridium.
Note accompanying a work detailing the study of voltaic circuits.
Explains how AS first learned of various compound salts of iron from medical writings.
A note accompanying a sample of high quality ferrocyanide of [iron?].
About chemical solutions used in photography, and problems produced by impurities in photographic paper.
Thanks JH for a specimen of 'mercury type,' which AS describes as he examined it under a microscope.