Smithsonian Report, 1910. — Munroe 



Plate 12. 



R.PM 57.5. DURATION OF FLAME! 1539. MILLISEC. HEIGHT OF FLAME 50.21 IN. 



A .BLACK BLASTING POWDER. 



R.PM. 2400. DURATION OF FLAME! .542 MILLISEC. HEIGHT OF FLAME 1979 IN. 



A PERMISSIBLE EXPLOSIVE ■, 



1. Flames from Explosives. 



2. X-RAY Photo of Fuse. 



