ted to the engine by
a piece of rubber tubing. The heat from a small gas stove will
furnish steam fast enough to run the engine at high speed. This
engine was built by W. G. Schuh and A. J. Eustice, of Cuba, Wis.

** Writing with Electricity [74]

Soak a piece of white paper in a solution of potassium iodide and
water for about a minute and then lay it on a piece of sheet
metal. Connect the sheet metal with the negative or zinc side of a
battery and then, using the positive wire as a pen, write your
name or other inscription on the wet paper.

[Illustration: Electrolytic Writing]

The result will be brown lines on a white background.
--Contributed by Geo. W. Fry, San Jose, Cal.

** To Photograph a Man in a Bottle [74]

Neither a huge bottle nor a dwarfed man is necessary for this
process, as it is merely a trick of photography, and a very
amusing trick, at that.

First, photograph the person to be enclosed in the bottle against
a dark plain background and mark the exact position on the ground
glass. Let the exposure be just long enough to show the figure
distinctly. Then place an empty bottle against a dark background
and focus so as to have the outlines of the bottle enclose those
of the man. Let this exposure be about twice the length of the
first, and the desired result is obtained.

** A Musical Windmill [74]

Make two wheels out of tin. They may be of any size, but wheel A
must be larger than wheel B. On wheel A fasten two pieces of wood,
C, to cross in the center, and place a bell on the four ends, as
shown. The smaller wheel, B, must be separated from the other with
a round piece of wood or an old spool. Tie four buttons with split
rings to the smaller wheel, B. The blades on the wheels should be
bent opposite on one wheel from the others so as to make the
wheels turn in different directions. When turning, the buttons
will strike the bells and make them ring constantly.

[Illustration: Musical Windmill]

** Optical Illusions [74]

By giving the page a revolving or rinsing motion the three
circular figures printed on the next page appear to rotate. The
best effect will be produced by laying the book down flat on the
desk or table and revolving, first

[Illustration: Move These Figures Rapidly with a Rinsing Motion]

in one direction and then in the opposite direction, in such a way
that any given point on the page will describe a circle of about
1/2 in. diameter. Fig. 1 then app