Magnesium fire bombs - the type that explode when you toss a bucket of water over them - are extinguished in half a minute with a perforated metal cone invented by James L. Danks, battalion chief of the Los Angeles Fire Department, The sieve-like apparatus helps smother the bomb, offers protection from exploding magnesium and at the same time allows a fine spray of water to play on the incendiary. The spray causes the bomb to burn out in a fraction of the normal time.