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Scientific American, Vol. 89, No. 20 (1903) (1903)

leaf 29

An illustration from Scientific American, Vol. 89, No. 20 (1903), 1903, leaf 29
minute particles, each of which emits a tiny flash of light on strik- H. & D. FOLSOM ARMS CO. New York | Money. Lists Free. ing the screen. Immediately under-the particle of radium the screen looks like a boiling luminous sea, while all around it there is a continuous sparkling scintillation.… … ‘They can be instaatly attached or de- tacbed. They never come loose—have a grip like a bulldog. GUN METAL CAUTION. Be sure that you find the above trade-mark, including the: words ‘“‘Goodyear Welt” on the Mllustraced catalogue on request. soles of every pair. Reject substitutes. Heart, Square,…

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