the
wheel. Mounted on the shaft with the pulleys is a guide for the
kite wire or string. The photograph shows that this guide permits
of being moved entirely over the top of the reel. The smaller
pulley is attached to the shaft and used as a brake. The brake is
used only when running out the wire or string, first removing the
crank.

** Attaching Runners to a Bicycle for Winter Use [157]

Instead of storing away your bicycle for the winter, attach
runners and use it on the ice. The runners can be made from
1/4-in. by 1-in. iron and fastened to the bicycle frame as shown
in the sketch. The tire is removed from the rim of the rear wheel
and large screws turned into the rim, leaving the greater part of
the screw extending. Cut off the heads of the screws and file them
to a point. The rear runners should be set so the rim of the wheel
will be about 1/2 in. above the runner level.
--Contributed by C. R. Welsh, Manhattan, Kan.

[Illustration: Bicycle Fitted with Runners for Snow]

** A Paper That Makes Green Prints [157]

A coating for ordinary paper that is said to give green prints is
made with a two per cent solution of gelatine, says Photography,
and sensitized with the following solution:

Potassium Bichromate 15 gr.
Magnesium Sulphate 25 gr.
Water 1 oz.

This mixture is spread over the paper in the usual way and the
paper dried in the dark. Printing is carried rather far. The print
is washed, then surface dried or blotted off on a pad and laid
film upwards on a sheet of glass, and the following developer is
applied with a wad of cotton wool wrung out:

Pyrocatechin 5 gr.
Water 1 oz.

The picture assumes a rich green color when developed, and is then
washed for five or ten minutes and dried quickly by heat.

** Copies Made from Wax Molds by Electro-Deposition [157]

Fine copies of wax impressions can be made in the following
manner: Procure an ordinary tumbler and fill it with a strong
solution of sulphate of copper, which is made by dissolving two
cents' worth of blue vitriol in 1/2 pt. of water. After this is
done make a porous cell by rolling a piece of brown paper around a
stick and fastening the edge with sealing wax; also, fix a bottom
to the cell in the same way. Make a solution of one part of oil of
vitriol and 5 parts of water and pour this mixture into the porous
cell. Wind the end of a copper wire around the end of a piece of
zinc