Report of the Committee on Ballistic Acoustics (1982) / Chapter Skim
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I. INTRODUCTION AND OVERVIEW
I. INTRODUCTION AND OVERVIEW
Pages 3-7
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From page 3... ...
is about 95%." This conclusion, together with the known shots from the Texas School Book Depository, was the basis of the finding by the House Select Committee on Assassinations that "scientific acoustical evidence establishes a high probability that two gunmen fired at President John F.Kennedy." On December 1, 1980, the Federal Bureau of Investigation (FBI) released a report, prepared by its Technical Services Division and dated November 19, 1980, with the findings that the above conclusion of the House Select Committee on Assassinations was not valid and that the acoustical evidence presented "did not scientifically prove that the Dictabelt recording on Channel 1...contains the sounds of gunshots or any other sounds originating in Dealey Plaza...." use the print version of this publication as the authoritative version for attribution.
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From page 4... ...
On January 31 and February 1, 1981, the Committee met with James Barger and Francis Jackson of Bolt Beranek and Newman Inc., with Mark Weiss and Ernest Aschkenasy of Queens College and with Bruce E.Koenig and others from the FBI Technical Services Division. Subgroups of the Committee have had many separate meetings and have carried out numerous individual studies, the results of which have been distributed to all members.
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From page 5... ...
The Committee agreed to continue its studies to challenge its own conclusion and to search for additional acoustic evidence. The Committee was greatly helped in its studies by the suggestion volunteered by Steve Barber that in the same tape position as the relevant acoustic impulses there was an almost unintelligible voice communication which he thought was cross talk from the Dallas Police Department Channel II, as recorded on a Gray Audograph disk.
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From page 6... ...
So in all cases when the Channel II recorder was inoperative, the "missing time" must be added to the "at least 30.9 seconds" noted previously. The Committee's two quite different techniques for determining the length of time between the real assassination and the one deduced from the study of sounds on the Channel II tape can, of course, be brought into agreement, at one minute, by the reasonable assumption that the Channel II recorder was not operating for a total of 44 seconds in a section of the recording in which the recorder operated for 206 seconds and in which there are many places where there are 3 to 6 seconds of recording silence.
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From page 7... ...
An evaluation of the November 19, 1981 FBI report is given in Section V In Section VI and Appendix F, the Committee, in response to its charge, lists some of the tests, analyses and evaluations that could be made to obtain better information from the Dallas Police Department recordings, but the evidence against the BRSW/WA conjectured grassy knoll assassination shot is already so strong that the Committee beleves the results to be expected from such studies would not justify their cost.
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