. . "Inventions History." . . . . . . . . "Boy's second book of inventions"@en . "Juvenile works" . "Juvenile works"@en . . . . . . . "Discusses the development of such inventions as the seismograph, solar motor, wireless telegraphy, steerable balloons, and the discovery and applications of radium."@en . "History"@en . . . . "Boys' second book of inventions" . "Boys' second book of inventions"@en . . . "Boys' Second Book of Inventions ... Fully illustrated"@en . . . . .