How to Make and How to Mend

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HOW TO MAKE AND HOW TO MEND - BY AN AMATEUR MECHANIC - 1900 - Make a box of very thin pine, cedar or other soft wood, 5 to G in. deep X 7 to 8 in. widc, and as long as the window in which it is to be placed is broad. Gluc two strips of wood across the top, one near each end, in. high X 2 in. thick, for bridges. Into each end of the box insert wooden pins, siniilar to those used for violins, and where they enter glue a plece of wood on the inside of the box to give strength. Cut a sounding hole in the middle of the top. Fasten one end of each string to a metallic pin in one end of the box and carry it over both bridges, fastening the other end to a wooden pin in the other end of the box, and tighten up. The strings should be small catgut or blue E violin strings. Tune all the strings in unison, and place the harp in the window. Four-stringed harps are most satisfactory, but a fewer number of strings can be used. ALARM BURGLAR. 1 Make a finely-tapered wedge of hard wood or metal, and attach a small plate of inetal loosely to one side. Insert a percussion-cap between the wedge and the metal plate attached, and place it under the door from the inside. To prevent the wedge from slipping along the floor, drill a hole in the floor close behind it and insert a mov- able stop. When the door is opened the cap will explode. 2 Attach two light strips of brass to thc beading over the door they should overlap, but not touch each other at any point, excepting when the door is opened, and then the lower strip should be pressed against the upper one. Attach one end of a I wire to one of the brass strips, and the other end to one terminal of a continuous ringing electric bell. Attach one end of another piece of wire to the other brass strip, and the other end to one terminal of an electric cell. Connect the remaining terminals of the bell and cell to- gether with a third wire. When the door is opened the bell will ring, and to prevent it ringing, when not wanted, disconnect either end of any wire, or place a switch in circuit, which can be moved so as to break the circuit during the daytime. ALARM CLOCK. Bore a hole in.............