CHAPTER XI

HOME-MADE ELECTRICAL TOYS 117 An Electro-magnet Derrick--The Electro-magnet--A Home-made Switch--The Derrick--The Windlass--The Hoisting Cables--How the Derrick Works--A Toy Shocking Machine--The Induction-coil--The Primary-coil--The Secondary-coil--The Handles--An Interrupter--How the Interrupter Works--A Toy Electric Motor Truck--The Wheels--The Upper Shaft--The Belts--The Battery--The Bi-chromate Battery Fluid--Amalgamating a Zinc Pencil--The Seat and Canopy-top--The Seat-arms--The Steering-wheel--The Levers.