[Illustration:  Warping the Aeroplane Wings]

shown in Fig. 2, the weight draws the lines to warp the plane so it will right itself automatically.  —­Contributed by Louis J. Day, Floral Park, N. Y.

** Repairing Christmas-Tree Decorations [11]

Small glass ornaments for Christmas tree decorations are very easily broken on the line shown in the sketch.  These can be easily repaired by inserting in the neck a piece of match, toothpick or splinter of wood and tying the hanging string to it.

[Illustration:  Repaired Decoration]

** Homemade Scroll Saw [11]

A scroll saw, if once used, becomes indispensable in any home carpenter chest, yet it is safe to say that not one in ten contains it.  A scroll saw is much more useful than a keyhole saw for sawing small and irregular holes, and many fancy knick-knacks, such as brackets, bookracks and shelves can be made with one.

A simple yet serviceable scroll saw frame can be made from a piece of cold-rolled steel rod, 3/32 or 1/4 in. in diameter, two 1/8-in. machine screws, four washers and four square nuts.  The rod should be 36 or 38 in. long, bent as shown in Fig. 1.  Place one washer on each screw and put the screws through the eyelets, AA, then place other washers on and fasten in place by screwing one nut on each screw, clamping the washers against the frame as tightly as possible.  The saw, which can be purchased at a local hardware store, is fastened between the clamping nut and another nut as shown in Fig. 2.

[Illustration:  Frame Made of a Rod]

If two wing nuts having the same number and size of threads are available, use them in place of the outside nuts.  They are easier to turn when inserting a saw blade in a hole or when removing broken blades.  —­Contributed by W. A. Scranton, Detroit, Michigan.

** How to Make a Watch Fob [12]

The fixtures for the watch fob shown—­half size—­may be made of either brass, copper, or silver.  Silver is the most desirable but, of course, the most expensive.  The buckle is to be purchased.  The connection is to be of leather of a color to harmonize with that of the fixtures.  The body of the fob may be of leather of suitable color or of silk.  Of the leathers, green and browns are the most popular, though almost any color may be obtained.

Make full size drawings of the outline and design of the fixtures.  With carbon paper trace these on the metal.  Pierce the metal of the parts that are to be removed with a small hand drill to make a place for the leather or silk.  With a small metal saw cut out these parts and smooth up the edges, rounding them slightly so they will not cut the leather or silk.  Next cut out the outlines with the metal shears.  File these edges, rounding and smoothing with emery paper.  The best way of handling the decorative design is to etch it and, if copper or brass, treat it with color.