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.
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