[Illustration:  How the Electric Piano is Constructed]

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.

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.

** Imitation Arms and Armor — part III [248]

Maces and battle-axes patterned after and made in imitation of the ancient weapons which were used from the

[Illustration:  Ancient Weapons]

fourteenth to the sixteenth century produce fine ornaments for the hall or den, says the English Mechanic.  The imitation articles are made of wood, the steel parts represented by tinfoil stuck on with glue and the ornaments carved out with a carving tool.

An English mace used about the middle of the fifteenth century is shown in Fig. 1.  The entire length of this weapon is about 24 in.; the handle is round with a four-sided sharp spike extending out from the points of six triangular shaped wings.  Cut the handle and spike from one piece of wood and glue the wings on at equal distances apart around the base of the spike.  The two bands or wings can be made by gluing two pieces of rope around the handle and fastening it with tacks.  These rings can be carved out, but they are somewhat difficult to make.  After the glue is dry, remove all the surplus that has been pressed out from the joints with the point of a sharp knife blade and then sandpaper the surface of the wood to make it smooth.  Secure some tinfoil to cover the parts in imitation of steel.  A thin coat of glue is quickly applied to the surface of the wood and the tinfoil laid on evenly so there will be no wrinkles and without making any more seams than is necessary.  The entire weapon, handle and all, is to appear as steel.