Fig. 16.
Instead of using a slab of glass, and tucking the end of the transfer underneath, a proper developing-board may be used as follows: A is a clamped board 18 inches by 12 inches, by 1 inch thick; B is another 4 inches by 12 inches; these are hinged together at C, the hinges being let into the boards underneath. Now, if the transfer be laid upon the board A, the end placed in the aperture C, then the pressure of the roller will cause the piece B to clamp the paper quite tight.
A few little differences in manipulation are required by the various transfer papers found on sale in the market. For this reason I add the instructions given by Prof. Husnik for his transfer paper.
Making the paper sensitive.
The development
For very fine reproductions
Take a pane of glass, coat it with a fatty substance, as tallow or wax dissolved in benzine; wipe the glass clean, so as to leave only a trace of fat on; lay the paper in the solution about one minute, drain off and then lay the paper face down on the glass, removing all air bubbles by rubbing over the back with a rubber straight edge, or better, a squeegee. When dry, the paper will leave the glass easily and will have a glass-like surface.
The inking.
The development is the same as above described. This later method gives excellent results.