The actual strength of the central powers in the air is at this time not definitely known to us. Such figures as we have are viewed with suspicion because of the two methods of observation in reporting an enemy squadron. This may be 24 planes to a squadron, that number representing the planes in active service in the air. But each squadron had a complement of replacement planes equalling the number of active planes, so that the squadron could be listed with 48 planes.
However, as some indication of the relative air strengths of the central powers we have a report from the chief of the Air Service of the American Expeditionary Forces showing that on July 30, 1918, Germany had 2,592 planes on the front and Austria 717.
THE GLENN MARTIN BOMBER.
The gross weight of this machine is 9,663 pounds. It can be equipped with five Lewis machine guns. Its ground speed is 113 miles an hour and its service ceiling is 12,800 feet. It climbs to a height of 6,500 feet in 10 minutes 45 seconds and to 10,000 feet in 21 minutes 20 seconds.
THE CAPRONI, EQUIPPED WITH THREE LIBERTY 12-CYLINDER ENGINES.