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. 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
Home-Made Merry-Go-Round
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 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
Emery wheel arbors should be fitted with flanges or washers having a slight concave to their face.