"Transistors and circuits electronics for young experimenters"@en . . . . . . . . . "Juvenile works" . "Juvenile works"@en . "Practical experiments in electronics from making and testing electroscopes to the construction and conversion of meters and other equipment." . "Practical experiments in electronics from making and testing electroscopes to the construction and conversion of meters and other equipment."@en . "Transistors and circuits; electronics for young experimenters" . . . . "Transistors and circuits : electronics for young experimenters" . . . . . .