[PrevPage] [Next] [INDEX ]  Volume 1   7 Apr. 1876    Page 98  [Source] [ NOTES ]

Friday April 7th 1876

Thoughts

  1. While at Osgood's today the idea came forcibly to me that the gelatine film [?] used in the Heliotype process may be made of use in Autographic Telegraphy.
    Gelatine being an animal product is probably a conductor of electricity offering considerable resistance to the passage of the ccurrent.
    Bichromate of potassium as used in the Heliotype process forms with the gelatine an insoluble compound under the action of light ­ which will probably offer less resistance to the passage fo the current than pure gelatine does.
    If then we write upon gelatine with Bichromate of potassium + then expose it to the light ­ the writing might conduct electricity from the style S fig 1 to the metal plate P below and the problem
[PrevPage] [Next] [INDEX ]  Volume 1   7 Apr. 1876    Page 98  [Source] [ NOTES ]