B-33 Vega Turrets. Photo are listed in the NACA Wartime report L-463, October 1942, Test of a Large Spherical Turret and a modified Turret on a Typical Bomber Fuselage by Axel T. Mattson.

B-33 Vega Turrets. Photo are listed in the NACA Wartime report L-463, October 1942, Test of a Large Spherical Turret and a modified Turret on a Typical Bomber Fuselage by Axel T. Mattson.