At the time of the assassination of President Kennedy the Dallas police recorded sounds from an open microphone; these sounds have been previously analyzed by two research groups at the request of the House Select Committee on Assassinations. Both groups concluded with 95% probability that the recordings contained acoustic impulses which provide evidence for the existence of a shot from the grassy knoll area of Dealey Plaza. On the basis of these results and since shots definitely were fired from the Texas School Book Depository, the House Committee concluded that "scientific acoustical evidence establishes a high probability that two gunmen fired at President John F. Kennedy.
Report of the Committee on Ballistic Acoustics studied these reports and the Dallas Police recordings on which they are based. This book reviews the methodology employed in the evaluations of the recorded acoustic data and of the conclusions about the existence of a shot from the grassy knoll. According to this report, the acoustic analyses do not demonstrate that there was a grassy knoll shot, and in particular there is no acoustic basis for the claim of 95% probability of such a shot. The acoustic impulses attributed to gunshots were recorded about one minute after the President had been shot and the motorcade had been instructed to go to the hospital. Therefore, reliable acoustic data do not support a conclusion that there was a second gunman.
Table of Contents
|I. INTRODUCTION AND OVERVIEW||3-7|
|II. DESCRIPTION OF STUDIES BY BRSW AND WA||8-11|
|III. EVALUATION OF THE BRSW AND WA METHODOLOGIES AND CONCLUSIONS||12-17|
|IV. TIMING EVIDENCE FROM MATCHING FEATURES||18-31|
|V. EVALUATION OF THE FBI REPORT||32-32|
|VI. POSSIBLE FURTHER STUDIES||33-33|
|APPENDIX A CRITICISM OF PROBABILITY CALCULATIONS||35-40|
|APPENDIX B ANALYSES OF SOUND SPECTROGRAMS OF "HOLD EVERYTHING..."||41-59|
|APPENDIX C TIMING OF CHANNEL I AND II EVENTS||60-80|
|APPENDIX D POSSIBILITY OF SUPERPOSED RECORDINGS||81-88|
|APPENDIX E SIREN SOUNDS||89-91|
|APPENDIX F POSSIBLE FURTHER STUDIES||92-112|
The National Academies Press (NAP) has partnered with Copyright Clearance Center's Rightslink service to offer you a variety of options for reusing NAP content. Through Rightslink, you may request permission to reprint NAP content in another publication, course pack, secure website, or other media. Rightslink allows you to instantly obtain permission, pay related fees, and print a license directly from the NAP website. The complete terms and conditions of your reuse license can be found in the license agreement that will be made available to you during the online order process. To request permission through Rightslink you are required to create an account by filling out a simple online form. The following list describes license reuses offered by the National Academies Press (NAP) through Rightslink:
Click here to obtain permission for the above reuses. If you have questions or comments concerning the Rightslink service, please contact:
Rightslink Customer Care
Tel (toll free): 877/622-5543
To request permission to distribute a PDF, please contact our Customer Service Department at 800-624-6242 for pricing.
To request permission to translate a book published by the National Academies Press or its imprint, the Joseph Henry Press, please click here to view more information.