The Tape That Changed the Official Record: Acoustics and the Second Gunman
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The Tape That Changed the Official Record: Acoustics and the Second Gunman
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ナレーター：
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著者：
(00:00:44) Six Seconds That Couldn't Be Contained
(00:01:46) How Oswald Got There
(00:03:01) The Warren Commission's Core Problem
(00:05:09) The Grassy Knoll and What Witnesses Said
(00:06:30) The Dictabelt
(00:07:50) What the Committee Did With It
(00:08:39) The Dispute That Followed
(00:09:54) What Circumstantial Evidence Can and Can't Do
(00:11:32) The Files That Stay Sealed
(00:12:20) Sixty Years and the Dictabelt's Legacy
In 1978, a Dictabelt recording retrieved from a Dallas Police cabinet upended the official record of the Kennedy assassination. The tape — police dispatch audio from November 22, 1963 — had sat largely forgotten for fifteen years. When acoustic analysts finally examined it, they reported detecting four distinct impulses consistent with gunshots, with one appearing to originate not from the Texas School Book Depository but from the grassy knoll. The House Select Committee on Assassinations used that finding to reach a conclusion the Warren Commission never had: probable conspiracy.
But the tape's story is more complicated than the headline. The Warren Commission had its own structural problem long before the Dictabelt surfaced — a five-point-six-second window captured on the Zapruder film, a Mannlicher-Carcano rifle with a minimum cycle time of roughly two-point-three seconds per shot, and a single-bullet theory that critics immediately branded physically implausible. Commission Exhibit 399, the nearly intact bullet alleged to have caused seven wounds in two men, remains one of the most disputed pieces of forensic evidence in American history.
Meanwhile, witnesses in Dealey Plaza were pointing toward the grassy knoll from the moment the shots rang out. Railroad workers on the overpass, bystanders near the fence line, and several law enforcement officers all reported hearing or seeing something in that direction — even as Howard Brennan and Amos Euins placed a rifle barrel unmistakably in the sixth-floor window above.
This episode examines what the acoustic evidence actually established, why the National Academy of Sciences later challenged it, and why the question of how many gunmen fired in Dealey Plaza remains genuinely unresolved sixty years on.
This episode includes AI-generated content.
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