America in World War I: "A few dirigibles," says Rear Admiral Sims, "located on the...

"A few dirigibles," says Rear Admiral Sims, "located on the flanks of a convoy, protected them almost as effectively as the destroyers themselves; and even a single airship not infrequently brought a group of merchantmen and troopships safely into port. All dirigibles had wireless telegraph and wireless telephone equipment. As soon as a submarine was spotted the word was immediately flashed broadcast and every offensive warship which was anywhere in the neighbourhood, as well as the aircraft itself started for the indicated scene." Illustration for US Official Pictures of the World War, showing America's Participation, selected from the official files of the War Department by William E Moore and James C Russell (Pictoria Bureau, 1920). Gravure printed.