[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 forefinger and held it close to the child’s nose.  The violent sneezing caused the button to be blown out.  Such an accident may come under the observation of any parent, and if so, this method can be used to relieve the child when medical assistance is not at hand.  —­Contributed by Katharine D. Morse, Syracuse, N. Y.

** Brass Frame in Repousse [237]

Punches can be purchased, as can the pitch bed or block.  Both can be made easily, however.  Several punches of different sizes and shapes will be needed.  A piece of mild steel, about 3/8 in. square, can be easily worked into tools shaped as desired.  A cold chisel will be needed to cut the metal to length; a file to reduce the ends to shape, and a piece of emery paper to smooth and polish the end of the tool so that it will not scar the metal.