Machine gun synchronizer in slow motion - GIF

[rdarrylb]

Roland Garros was a French pilot that mounted metal deflector wedges on the rear side of his propeller. He managed to shoot down 5 German planes before a malfunction and he crashed behind enemy lines, revealing the device to the Germans. Anthony Fokker came up with the interrupter device. I'm not sure that the metal wedge was ever used by others...