National Geographic : 1940 Jul
Photograph by J.Baylor Roberts Using Full-sized Dummy Air Bombs, an Air-Raid Protection Corps Shows What todo"InCase" These wooden dummies represent real bombs of 100-, 250-, and 500-pound size. On the card at left, held up to the girls, isachart that shows how bombs work. In this demonstration the lecturer ignited a small quantity of the incendiary material used in the bombs to show its effectonmetals and itsindifference towater. Black-out drills are also held periodically, and often at night searchlight beams and antiaircraft gun practice wake up the whole island.