[Illustration: How the Joint Is Cut]

wood, the illustration, of course, shows only two sides, the other
two are identical. The joint is separable and each part is solid
and of one piece. In making, take two pieces of wood, preferably
of contrasting colors, such as cherry and walnut or mahogany and
boxwood, about 1-1/2 in. square and of any length desired. Cut the
dovetail on one end of each stick as shown in Fig. 2, drive
together and then plane off the triangular corners marked A. The
end of each piece after the dovetails are cut appear as shown in
Fig. 3, the lines marking the path of the dovetail through the
stick.

** Radiator Water [236]

Pure rain water is the best to use in a cooling system of an
automobile engine, as it is free from the mineral substances which
are deposited in the radiator, piping and jackets by hard water.

** Springboard for Swimmers [237]

A good springboard adds much to the fun of swimming. The boards
are generally made so that the plank will bend, being dressed down
thin at one end and fastened. The thinness of the plank, or an
insecure fastening, causes many a plank to snap in two or come
loose from its fastenings in a short time.

The accompanying sketch shows the method of constructing a
springboard that does not depend upon the bending of the wood for
its spring. It is made of a plank, 2 in. thick and from 14 to 16
ft. long, one end of which is secured with a hinge arrangement
having a U-shaped rod whose ends are held with nuts. On each edge
of the board, at the lower end, are fastened two pieces of strap
iron, each about 1 ft. long and with the lower ends drilled to fit
the horizontal of the U-shaped rod.

Secure a pair of light buggy springs from a discarded rig and
attach them to the ends of a square bar of iron having a length
equal to the width of the plank. Fasten this to the plank with
bolts, as shown in the sketch. Should the springs be too high they
can be moved forward.
--Contributed by John Blake, Franklin, Mass.

[Illustration: Buggy Springs Used beneath the Board]

** Taking Button from a Child's Nostril [237]

A three-year-old child snuffed a button up its nostril and the
mother, in an attempt to remove it, had caused the button to be
pushed farther up the channel. Doctors probed for the button
without success. The distracted mother happened to think of snuff,
and, as there was some at hand, took a pinch of snuff between the
thumb and foref