Smithsonian Report, 1910. — Munroe. 



Plate 12. 



RPM 37.5. DURATION OF FLAME 1539. MILLISEC. HEIGHT OF FLAME 50.21 IN. 



A BLACK BLASTING POWDER. 



R.RM. Z400. DURATION OF FLAME .342 MILUSEC. HEIGHT OF FLAME 1939 IN. 



A PERMISSIBLE EXPLOSIVE 



1. Flames from Explosives. 



2. X-ray Photo of Fuse. 



