sly soaked in water, is applied upon it (taking care to
avoid air bubbles) and squeezed, lightly at first, with some force
afterwards, to insure a perfect contact.

Zinc plates are also employed as provisory supports instead of glass, opal
or porcelain plates. The modus operandi is exactly the same.(30) The
plates should be well planed, free from scratches, etc., and well polished
to obtain glossy pictures without one having recourse to a film of
collodion. For matt pictures, i.e., without gloss whatever, the plate
should be finely granulated, and when waxing a very light pressure should
be exerted to remove the excess of wax, else it might be quite impossible
to strip off the picture in transferring on paper.

For double transfer on biscuits, objects in alabaster, porcelain, wood,
any even or curved rigid materials, flexible supports are employed to
develop the pictures. These supports are prepared by fastening albumen
paper on a board and evenly brushing over the following hot compound,
filtered through flannel, which, when dry, is polished with a cloth:
Stearine 15 parts
Rosin 3 parts
Alcohol 100 parts

The flexible supports should be waxed, then collodionized for full gloss,
as the glass, porcelain and metallic plates.

Another method which the writer recommends is the following, due to Mr.
Swan: Immerse a sheet of paper in a solution of India rubber, 4:100 of
benzole, and let dry, which requires a few minutes. This is the flexible
support. Then after exposure, brush over the India rubber solution on the
carbon tissue, apply upon it the support when the benzole is evaporated,
and pass the whole under a rolling press to secure adhesion, then develop.
To transfer, soak the proof in tepid water, apply it on the material
prepared, as it will be explained further on, and when dry, imbue the
support from the back with benzole, to soften the India rubber, and strip.

To dispense with a rolling press, the proof may be developed on lacquered
vegetable paper prepared by immersion in a solution of 10 parts of red
shellac in 100 parts of alcohol. After developing the proof is coated
with alumed gelatine, and when dry transferred as usual. To strip off it
suffices to imbue the paper with alcohol in order to dissolve the shellac.

When the picture must be transferred on small spaces or on small objects
the most simple method--the most effective, perhaps--is the following,
devised some years ago by the write