_Drying of the Moulded Pieces._--When the moulded pieces become of a
proper consistency in the mould, they are exposed to the air and then
taken to the drying room. But, as with plaster, the surface of the paste
dries very quickly, and this inconvenience (which amounts to nothing in
pieces that are to be polished) is very great in pieces that carry
ornaments in relief, since the finishing of these is much more difficult,
the hardened paste works badly, and frequently flakes off. In order to
remedy this inconvenience, it suffices to dust the places to be preserved
with powdered dry paste.--_Revue Industrielle._

* * * * *




PHOTO-TRICYCLE APPARATUS.


[Illustration: A PHOTO-TRICYCLE APPARATUS.]

This consists of a portable folding camera, with screw focusing
arrangement, swing back, and an adapter frame placed in the position of
the focus screen, allowing the dark slide to be inserted so as to give the
horizontal or vertical position to the dry plate when in the camera. To
the front and base-board a brass swiveled side bar, made collapsible by
means of a center slot, is attached by hinges, and this renders the camera
rigid when open or secure when closed. The base-board is supported on a
brass plate within which is inserted a ball-and-socket (or universal joint
in a new form), permitting the camera to be tilted to any necessary angle,