[Illustration: A BATTLE OF FOUR ELEMENTS
British monitors shelling the German land batteries near Nieuport.
German submarines were actively engaged in trying to torpedo these
monitors and the British monoplane was useful for giving the range to
the ship and reporting the accuracy of the shots.]
[Illustration: ZEPPELIN DEVICE FOR DROPPING BOMBS
An armored car is suspended by three cables from the Zeppelin airship to
a distance of several thousand feet below the monster aircraft, which is
concealed in the clouds above. (_Sphere copr._)]
[Illustration: A BELGIAN MILITARY OBSERVATION BALLOON
The car of this balloon is equipped with wireless, which is used to send
word of the gun positions of the enemy, movements of troops, ranges for
the gunners and much other valuable information. A cable holds the
balloon captive.]
[Illustration: THE FRENCH DIRIGIBLE AIRSHIP, “LA PATRIE”]
[Illustration: _Copyright by Underwood & Underwood, N. Y._