ket is provided for the liquid developer in one end of the
tray when it

[Illustration: Developing Tray with Glass Bottom]

is turned up in a vertical position. A tray for developing 5 by
7-in. plates should be made 8 in. square inside. The side pieces
with the grooves for the glass are shown in Fig. 1. Two of each of
these pieces are made with mitered ends. The short groove shown in
the top piece of the illustration is for inserting the plate
covering on the pocket end of the tray.

Two blocks, one-half the length of the side pieces, are put in
between the glass plates to hold the plate being developed from
dropping down when the tray is tipped up in a vertical position.
The glass bottom of the tray is 8-1/2 in. square, which allows 1/4
in. on all edges to set in the grooves of the side pieces. The
wood pieces should be well soaked in hot paraffin, and the mitered
corners well glued and nailed.
--Contributed by J.A. Simonis, Fostoria, Ohio.

** Iron Putty [269]

A good filler used as a putty on iron castings may be made as
follows: Take, by weight, 3 parts of stiff keg lead, 5 parts of
black filler, 2 parts of whiting, 5 parts of pulverized silica and
make into a paste with a mixture of one part each of coach japan,
rubbing varnish and turpentine.

** Rubber Bands in Kite Balancing Strings [270]

Kite flyers will find it to their advantage to place rubber bands
of

[Illustration: Bands in String]

suitable size in the balancing strings to the kite, as shown in
the illustration. This will prevent a "break-away" and also make
the right pull, if only two bands are put in the lower strings.
--Contributed by Thos. DeLoof, Grand Rapids, Michigan.

** An Aid in Sketching [270]

Sketching requires some little training, but with the apparatus
here illustrated an inexperienced person can obtain excellent
results. The apparatus is made of a box 8 in. deep, 8 in. wide and
about 1 ft. long. A double convex lens, G, is fitted in a brass
tube which should have a sliding fit in another shorter and larger
tube fastened to the end of the box. A mirror, II, is set at an
angle of 45 deg.

[Illustration: Sketching Aid]

in the opposite end of the box. This reflects the rays of light
passing through the lens to the surface K, which may be either of
ground or plain glass. The lid or cover EF protects the glass and
keeps the strong light out when sketching. The inside of the box
and brass tube are painted a dul