DeLand pool. Improvised foundry, Daytona Beach. A new kind of air raid siren is resulting from a fireman's curiosity about aluminum. City fireman J.L. Clayton of Daytona Beach, Florida, became interested in metals and put up a one-man foundry for a hobby in the rear of the fire station. Today he is molding aluminum air raid sirens in a rapidly expanding foundry and is handling molded aircraft parts for the DeLand, Florida, industrial pool. R.G. Campbell, Jr., foreman of the shop; Lewis Pollity, formerly an electrician, and Clayton examine a newly-cast siren "blade"