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'.
About a letter of recommendation JH is preparing for Robert Hunt.
Encloses sequel to AS's volume on electro-biology, which AS dedicated to JH. Both are being translated into French.
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.
Describes experiments in the electrochemical decomposition of metallic salts.
Further on the electrochemical decomposition of metallic salts [see AS's 1843-2-28], and its relationship to photography.
On the usefulness of 'Bishmuth' candles, and some necessary additions to a future edition of AS's book.
Responds to comments about Robert Hunt [see JH's 1845-4-2]; talks about making an artificial eye.
Thanks for JH's certificate concerning AS's battery, now finding increasing support.
Sends a note along with a work on vision.
Has been preparing famine food, such as hay biscuits.
About the eye's means of adjusting in vision; asks JH's permission to dedicate AS's writings on vision to JH.