1929 11 20 Franklin Institute THE AUTOGIRO: ITS CHARACTERISTICS AND ACCOMPLISHMENTS By Harold F. Picarin President, Pitcairn-Cierva Autogiro Company of America Smithsonian Report, 1930.–Pitcairn LANDING BEFORE OBSTACLES PCA-2, 1930, AT PITCAIRN FIELD, WILLOW GROVE, PA. PLATE 9
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1929 11 20 Franklin Institute THE AUTOGIRO: ITS CHARACTERISTICS AND ACCOMPLISHMENTS By Harold F. Picarin President, Pitcairn-Cierva Autogiro Company of America Smithsonian Report, 1930.–Pitcairn THE “DEVIL’S DARLING NEEDLE” PLATE 2