Learn about electromagnetism and transform a metal screw into a magnetic hammer. Complete an electric circuit with it to construct this handy doorbell. Use it in your room as a cool science gadget. Contents base board, bell, coil cover, L-shaped cover, battery cover, hammer, coil, adjuster holder, hammer holder, washer screw, screws, adjuster, wire with metal ring,
long screw and nut, terminal caps and detailed instructions. (Doorbell will be about 16.5cm in length. Also required but not provided: 2 x 1.5V AA battery and a small crosshead screwdriver.)
Awards: 2015 TDmonthly Top Toy Award
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