Questions JH's intent to display 'photogenic drawings' to R.S.L.
Showing 21–32 of 32 items
Questions JH's intent to display 'photogenic drawings' to R.S.L.
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.
Further chemicals used for fixing, including bromide potash.
Comments on Louis Daguerre's use of muriatic ether, and encloses a photograph of hand writing.
Comments on a number of chemicals used in photography, as well as referring to JH's process of making 'enlargements.'
Consists mostly of a transcription of two short notes from J. B. Biot to JH by way of WT.
Sends a sample picture fixed by use of iodine [potash].
More photography comments. Problems with use of hyposulfite fixer. Superiority of English over Daguerreotype in being able to make copies.
Confused by an 'unfixed' photo from JH in which the image shows different effects from different colors of the spectrum. Also other comments on photography.
Sends JH a positive copy and a transparency. Remarks on JH's use of muriate of lead and asks JH to explain chemistry of it.
Advises JH not to publish any new processes in photography as there are patent problems. Comments on the Daguerreotype, and on the difficulty of preserving images in some circumstances.
Sends some samples of photography made with a solar microscope, and comments briefly on the Daguerreotype.