"Halt! Show Your Papers!"[ToList]
On the roads in the war zone there are sentries at frequent intervals and they are all suspicious.
A Nieuport Biplane About to Take the Air.[ToList]
The pursuit or battle squadrons—the escadrilles de chasse—are composed of small and very fast planes, such as the Spad and Nieuport.
Until very recently the Nieuport biplane, which can attain a speed of one hundred and ten miles an hour, has been considered the fastest and most efficient, as it is the smallest, of the French battle-planes, but it is now out-speeded by the new Spad[C] machine, which has reached a speed of over one hundred and twenty miles an hour, and of which great hopes are entertained. The Spad, like the Nieuport, is a one-man apparatus, the machine-gun mounted on its upper plane being fired by the pilot with one hand, while with the other hand and his feet he operates his controls. On the "tractors," as the airplanes having the propellers in front are called, the machine-guns are synchronized so as to fire between the whirling blades. Garros, the famous French flier, was the first man to perfect a device for firing a machine-gun through a propeller. He armored the blades so that if struck by a bullet they would not be injured. This was greatly improved upon by the Germans in the Fokker type, the fire of the machine-guns being automatically regulated so that it is never discharged when a blade of the propeller is directly in front of the muzzle. Since then various forms of this device have been adapted by all the belligerents. Another novel development of aerial warfare is the miniature wireless-sending apparatus with which most of the observation and artillery regulation machines are now equipped, thus enabling the observers to keep in constant touch with the ground. In addition to developing the fastest possible battle-planes, the French are making efforts to build more formidable craft for bombing purposes. The latest of these is a Voisin triplane, which has a total lifting capacity of two tons, carries a crew of five men, and is driven by four propellers, each operated by a 210-horse-power Hispana-Suiza motor. These new motors weigh only about two hundred kilograms, or a little over two pounds per horse-power.
During the past year the French have made most of their raids by nights. One reason for this is that raiding craft, which are comparatively slow machines, are so heavily laden with bombs that they are only able to perform straight flying and hence are easily brought down by the fast and quick-turning battle-planes. Daylight raids, moreover, necessitate an escorting fleet of fighting craft in order to protect the bombing machines, just as a dreadnought has to be protected by a screen of destroyers. Though the dangers of flying are considerably increased by darkness, the French believe this is more than compensated for by the fact that, being comparatively safe from attack by enemy aircraft or from the fire of anti-aircraft guns, the raiders can fly at a much lower altitude and consequently have a much better chance of hitting their targets.