ScientificAmerican1921-03-12.jpg Scientific American 1921-03-05ThumbnailsScientific American 1921-03-19Scientific American 1921-03-05ThumbnailsScientific American 1921-03-19Scientific American 1921-03-05ThumbnailsScientific American 1921-03-19Scientific American 1921-03-05ThumbnailsScientific American 1921-03-19

Spinning and cutting a mass of soft clay to form an electrical insulator. Also, "Brief facts about money" and "Solving the labor problem".