Make or buy a table, about 3 ft. long and 1 ft. or more wide, and about 2-1/2 ft. high. Nail a board, A, Fig. 1, about 8 in. wide and of the same length as the table, to the table, as shown in the illustration. Paint the table any color desired.
Purchase a dozen or so battery electric bells (they are cheaper if bought by the dozen) and screw to the board, as in Fig. 2. Arrange the bells in the scale shown at B, Fig. 2. Bore two holes near the posts of each bell for the wires to pass through. Buttons for the bells may be purchased, but it is cheaper to make them in the following way: Take a piece of wood and cut it round, about 2-1/2 in. in diameter and 1/4 in. thick, Fig. 3, and bore two holes, C and D, through it. Then get two posts, about 1 in. long, (battery posts will do) and put them through the holes as in Fig. 4. Cut out a piece of tin, 3/8 in. wide, punch a hole through it and put in under post E, so that when it is pressed down, it will touch post F. It may be either nailed or screwed down.
How the Electric Piano is Constructed
Make two holes in the table for each button and its wires, as at H, Fig. 2. Nail or screw the buttons to the table, as shown in Fig. 5, with the wires underneath. The connections are simple: I, Fig. 5, is a wire running from one end of the table to the other end, attached to a post at each end; J is another wire attached in the same way; L is the carbon wire running from the batteries to I; M is the zinc wire running from the batteries to wire J; 0 indicates the batteries; P is a wire running from J to one post of a button; Q is another wire running from the other post of the button to one of the posts of the bell; R is a wire running from I to one post of the bell. When the button S is pressed, the bell will ring. Each button should be connected with its bell in the same way. --Contributed by Vincent de Ybarrondo.