This book is about the first homemade young technicians. It tells how from the simplest materials: plywood, planks, slats, scraps of tin and copper - you can make useful and beautiful products. The homemade products described in the book will come in handy for you in everyday life, on hikes, and in your studies. Some of them you decorate the pioneer room, the school premises, your home corner. Physical instruments and installations will serve as a good teaching aid in science and physics lessons...