When these parts have been put together in the manner described, connect the device in circuit with an electric bell, and place it behind a stove.

[Illustration:  Simple Fire Alarm]

When the stove becomes too hot the wax will melt at the ends, allowing the springs to contact at C, and the alarm bell will ring.  —­Contributed by J. R. Comstock, Mechanicsburg, Pa.

** To Build a Merry-Go-Round [359]

This is a very simple device, but one that will afford any amount of amusement.  The center post rests in an auger hole bored in an old stump or in a post set in the ground.  The stump makes the best support.  The center pole should be 10 ft. high.  An old wheel is mounted at the top of the pole, and the pole works in the wheel as an axle, says the American Boy.  The wheel is anchored out by several guy

[Illustration:  Home-Made Merry-Go-Round]

wires.  The seat arms may be any length desired.  A passenger rides in each seat and the motorman takes his station at the middle.

** Arbor Wheels [359]

Emery wheel arbors should be fitted with flanges or washers having a slight concave to their face.

** Novelty Clock for the Kitchen [360]

An inexpensive and easy way to make an unique ornament of a clock

[Illustration:  The Clock with Holder]

for kitchen use is to take an old alarm clock or a new one if preferred, and make it into a clock to hang on the wall.  Take the glass, dial and works out of the shell and cut some pieces out of the metal so that when the pieces left are turned back it will have the appearance as in Fig. 1.  Then get a 10-cent frying pan, 6 in. in diameter, and drill a hole in the center so the shaft for the hands will easily pass through and extend out far enough to replace the two hands.  Put the works back in the metal shell and solder it to the frying pan by the pieces turned out as in Fig. 2.  Gild the pan all over, including the handle, and print black figures in the small circles.  Calendar figures can be pasted on small circles and these pasted on the frying pan.  The parts can be divided into minutes with small lines the same as shown in the drawing.  Make new hands that are long enough to reach the figures from sheet brass or tin and paint them black.  —­Contributed by Carl P. Herd, Davenport, Iowa

** How to Make a Small Silver Plating Outfit [360]

Take an ordinary glass fruit jar or any other receptacle in glass, not metal, which will hold 1 qt. of liquid and fill it with rain or distilled water and then add 3/4 oz. of silver chloride and 1-1/2 oz. of c.p. potassium cyanide.  Let this dissolve and incorporate well with the water before using.  Take an ordinary wet battery and fasten two copper wires to the terminals and fasten the other ends of the wires to two pieces of heavy copper wire or 1/4-in. brass pipe.  The wires must be well soldered to the brass pipe to make a good connection.  When the solution is made up and entirely dissolved the outfit is ready for plating.