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 IN

THE DAWN OF THE FOURTH ARM

BY

M.INST.C.E. M.INST.A.E. MEMBER ADVISORY COMMITTEE FOR AERONAUTICS AUTHOR OF "AREIAL FLIGHT" * AERODYNAMICS ** AERODONETICS

WITH INTRODUCTORY PREFACE BY

MAJ.-GEN. SIR DAVID HENDERSON, K.C.B. DIRECTOR GENERAL OF MILITARY AERONAUTICS

LONDON

CONSTABLE AND COMPANY LIMITED ORANGE STREET LEICESTER SQUARE 1916