the other, while they were damp, on the cloth, face
downward, and proceeded to roll the cloth and prints quite close
on the can. I then pinned the end of the cloth to keep it from
unwinding and set the whole in a draft for drying.

The curvature of the can just about

[Illustration: Rolling Up the Prints]

counteracted the tendency of the coating on the paper to make the
prints curl and when they were thoroughly dried and removed they
remained nice and flat.
--Contributed by W. H. Eppens, Chicago.

** Piercing Glass Plates with a Spark Coil [426]

Anyone possessing a 1-in. induction coil and a 1-qt. Leyden jar
can easily perform the interesting experiment of piercing glass
plates. Connect the Leyden jar to the induction coil as shown in
the diagram. A discharger is now constructed of very dry wood and
boiled in paraffine for about 15 minutes. The main part of the
discharger, A B, is a piece of wood about 6 in. long and to the
middle of it is fastened a wood handle by means of one or two wood
screws. A binding-post is fastened to each end of the main piece
or at A and B as shown in the diagram.

[Illustration: Puncturing Glass Plates]

Two stiff brass wires of No. 14 gauge and 6 in. long, with a small
brass ball attached to one end of each, are bent in an arc of a
circle and attached one to each binding-post. A plate of glass, G,
is now placed between the two brass balls and the coil set in
action. The plate will soon be pierced by the spark. Larger coils
will pierce heavier glass plates.
--Contributed by I. Wolff, Brooklyn, N. Y.

** A Home-Made Still [426]

Remove the metal end of an old electric light globe. This can be
done by soaking a piece of twine in alcohol and tying it around
the globe at the place the break is to be made. Light the string
and after it is burned off, turn cold water on the globe. The
result will be a smooth break where the string

[Illustration: The Complete Still]

was placed. Purchase a piece of glass tubing from your druggist
and secure a cork that will fit the opening in the glass bulb.
Bore a hole in the cork the right size for the glass tube to fit
in tightly. If you cannot get a glass tube with a bend in it, you
will have to make a bend, as shown in the illustration, by heating
the tube at the right place over an alcohol lamp and allowing the
weight of the glass to make the bend while it is hot.

Insert the short end of the tube in the cork and place the other