2019 Reprint of 1927 Edition.  Full facsimile of the original edition, not reproduced with Optical Recognition software.  The Tunnel Thru the Air, Or Looking Back from 1940 is a science fiction novel written by market forecaster William Delbert Gann in 1927.  In the Foreword, Gann hinted that this book is more than just a novel because it contains a valuable secret, clothed in veiled language. According to Gann, some will find it the first time they read it, others will see it in the second reading, but the greatest number will find the hidden secret when they read it the third time. Some traders believe Gann had encoded some techniques of financial astrology into this book and some even claim that they have devoted a lifetime to study this text.