Media type: E-Article Title: Inventions New and Interesting Contributor: Jopp, Fred G.; Hunting, M. M.; Kolbe, A. H.; Child, Allen P.; Purdy, E.; Ridgely, H. C. Published: 1922 Published in: Scientific American, 126 (1922) 3, Seite 203-206 Language: English ISSN: 0036-8733; 1946-7087 Origination: Footnote: