"Berlin flak protection
All around the capital in a wide arc lies a broad iron line of defense, the safe haven of the imperial capital from enemy attacks from the air. Day and night the men of the air defense, whether on anti-aircraft gun, searchlight, or listening device, are on the watch. We take photographs of the visit of our reporter to the anti-aircraft artillery.
Shown here: one of the giant listening devices that can capture even the slightest noise of an engine.”
"A Cierva autogiro / autogyro (instead of a plane with wings a propeller) in Barcelona on takeoff at tram line wires and crashed flown, Spain 1935." (via)
“Will Defy the laws of Gravitation
Under basic patents granted to W. Pitts of Los Angeles California., W.P. Kindree has developed this unique helicopter with which he hopes to take to the air shortly. The motor, not yet installed, weighs 235 pounds and develops 65 horse power. The mushroom propellor composed of sixty blades may be tipped 45 degrees in any direction, which means that after the plane once gains altitude it may be flown in the manner of an ordinary plane. The mushroom rotates and reciprocates 20 inches with each revolution. 29/10.30”