Arthur G. Stangland

aerocar n.	1929 A. G. Stangland Ancient Brain in Science Wonder Stories Oct. 403/1 Aerocars floated about in the air above the thoroughfares. Jak explained that invisible repulsion rays suspended them in space.
gravity screen n.	1932 A. G. Stangland 50th Century Revolt in Wonder Stories Apr. 1208/2 For twenty or thirty miles into the back-bone of the Andean mountains massive reinforced steel tubes were driven to withstand the terrific constant strain of the tubes as they sent forth a vast field of gravitation, retarding the motion of the planet. The huge gravity screens of the tubes fed on large vats of silicon dust which broke down atomically, releasing a powerful negative field of gravity.
ray pistol n.	1932 A. G. Stangland 50th Century Revolt in Wonder Stories Apr. 1219/2 Damn it, he was hauling out one of those vicious ray pistols he'd been dodging. Wonder if he'd hit him before the prince could ray him?