1
JFK Assassination Plus General Discussion And Debate / Re: Passing of Former HSCA Chief Counsel G. Robert Blakey
« Last post by Michael T. Griffith on Today at 01:07:05 AM »If the motorcycle with the stuck open mike was not at the required location at the time required, the timing of impulses or cross talk is irrelevant. The photographic evidence shows no motorcycle as required by the acoustics evidence.
Not true. I would refer you to Dr. Donald Thomas's extensive research on this issue. The photographic evidence is not a complete, second-by-second record of the events in Dealey Plaza, but Dr. Thomas makes a strong case that McClain was in the right position to have been in position to record the sounds on the dictabelt.
The Dealey Plaza site test done by the BBN scientists proved that the dictabelt was recorded during the assassination. Even the NRC/NAS panel concluded there was a 93% chance that the timing-movement correlations identified by the BBN scientists between the dictabelt impulses and the test-firing impulses occurred because the dictabelt was recorded during the assassination.
Have you read the HSCA materials on the acoustical evidence? How about Dr. Josiah Thompson's extensive discussion on the new developments from new research into the acoustical evidence done at BBN in 2019-2020 in his 2021 book Last Second in Dallas? His two chapters and appendices on the acoustical evidence total 114 pages. Dr. Thompson also spends considerable time on the issue of which patrol bike's mic recorded the impulse patterns on the dictabelt--he, too, makes a strong case that McClain's mic recorded those sounds.
And if you go on to claim the photographic evidence was altered, then acoustic evidence is still meaningless because the impulses were matched to the Zapruder film.
This is an overstatement and an oversimplification. There was disagreement among the HSCA experts about matching the gunshot impulses with events in the Zapruder film. Furthermore, as I have explained in other threads, the dictabelt did not necessarily record all of the shots fired in Dealey Plaza for two possible reasons: shots could have been fired several feet away from a window and/or a silencer could have been used. The acoustical scientists noted that if a gunman fired 6-8 feet back from a window, the dictabelt probably would not have recorded the sound.
Also, we need to keep in mind that because of restrictions imposed by the committee, the BBN test firing in Dealey Plaza was limited to the sixth-floor window and the grassy knoll. If shots had been fired from one or two of the lower floors of the Dal-Tex Building or the County Records Building, more dictabelt impulse patterns may have been matched with test-firing impulse patterns.
If anyone is interested in an extensive introduction to the acoustical evidence, here's the link to my article "The HSCA's Acoustical Evidence: Proof of a Second Gunman":
https://drive.google.com/file/d/1KvdvH8gTqFgMn-2vTI5ppg_egWxRKg9U/view.
Recent Posts

