Will give a paper on fixing the image formed by the camera obscura to R.S.L. and wants to review it with JH first.
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Will give a paper on fixing the image formed by the camera obscura to R.S.L. and wants to review it with JH first.
[Responding to WT's 1839-1-25], JH reports that he cannot come to London to see WT's 'curious process of fixing the image formed by a Camera obscura.' Invites WT to come to Slough.
JH is indisposed, so WT will come to Slough to review paper [see WT's 1839-1-25]. Asks JH about appropriate curve on lenses for camera obscura for 2-foot focus.
Has received urgent request from Athenaeum to allow them to publish paper on 'Photogenic Drawing' before it is read to R.S.L. in light of announcement of the 'Parisian invention.'
[Responding to WT's 1839-1-29], urges WT to find some way of giving at least slightly different papers to R.S.L. and Athenaeum. Comments on process of fixing image, referring to a trial of his own.
More about paper being published in both the R.S.P.T. and Athenaeum.
Questions JH's intent to display 'photogenic drawings' to R.S.L.
Considerable comment on procedure for submitting paper to R.S.L. Urges WT to mention JH's method of washing with hyposulfite. Comments on some photographic experiments of WT.
JH welcomes WT's mentioning JH's method of fixing with hyposulfite. JH has put some of JH's images on display at R.S.L. Mentions JH's recent experiments relating to photography. Comments regarding a paper submitted to R.S.L. by WT and on some experiments of WT.
Wants to withhold description of 'developing' process until it is perfected to obviate others using it. Also refers to second process to make 'positive' and 'negative.'
JH will as WT requests stop mentioning JH's hyposulfite fixing process and await publication of WT's process. Reports in detail on some of JH's experiments relating to photography and to spectrum analysis. [In a P.S. dated 1839-2-13,] JH states: 'I have discovered your secret of fixing [or its] equivalent.'
Some comments on JH's light and photography experiments, especially effects of different kinds of glass and fixing with ferrocyanate.
Describes mediocre results obtained using ferrocyanate of potash for fixing image. Mentions some other methods, including his favorite, common salt. Asks JH to keep these secret.
Finally had success washing with ferrocyanate. Wants to present note of 'his' processes to R.S.L. and so to the world.
Wishes to communicate to J. B. Biot, and so to Academie des sciences, JH's two 'beautiful' fixing methods, by hyposulfite and ferrocyanate.
Invites WT to mention JH's hyposulfite process to J. B. Biot. Recounts JH's recent experiments.
Enlarges upon his method of using salt as photographic fixer; then asks JH to explain the chemistry thereof. Has tried Louis Daguerre's fixing process without success.
Sent WT's specimens to J. B. Biot and F. J. D. Arago in Paris. Developed paper sensitive to heat rays of sun 'beyond the spectrum.' Diagram of three spectra: 'luminous, chemical, and thermic.'
Further chemicals used for fixing, including bromide potash.
Thanks for specimen of light sensitive paper. Provides hint on the chemical process that Louis Daguerre may have used in his photographic work. Sends specimens of JH's own work.