Ok, men hur väl kände man till detta på 1960-talet?
Mr.WEISS. Well, the principles are basically the fundamental principles in acoustics, namely, that if someone makes a loud noise somewhere, like here [witness claps his hands], that sort of thing, everybody in this room can hear that noise, which means that sound moves out in all possible directions.
A second principle is that that sound which they hear directly also will bounce off walls and be reflected.So they will hear not only the direct sound but also sounds called echoes bouncing from walls, corners, and other surfaces.
The third principle, also very fundamental, is that the speed of sound is constant in whatever direction it may go.
Ok, så uträkningarna befinner sig på gymnasienivå.
Mr.CORNWELL. How well established are these acoustics principles you have been describing?
Mr.WEISS. These have been established a very long time. They have been known for several hundred years. These are fundamental things in acoustics, the things taught in high school or college undergraduate level physics.
Nix, det gjorde det inte. Bara gymnasiefysik.
Mr. CORNWELL. Were there other more complex or more sophisticated principles that you were required to use in your analysis which were not so well established, which were newer or less well established?
Mr.WEISS. No, Sir. We only needed to apply these basic welltested, well-established principles;nothing more.
Ok, men hur väl kände man till detta på 1960-talet?
Mr.WEISS. Well, the principles are basically the fundamental principles in acoustics, namely, that if someone makes a loud noise somewhere, like here [witness claps his hands], that sort of thing, everybody in this room can hear that noise, which means that sound moves out in all possible directions.
A second principle is that that sound which they hear directly also will bounce off walls and be reflected.So they will hear not only the direct sound but also sounds called echoes bouncing from walls, corners, and other surfaces.
The third principle, also very fundamental, is that the speed of sound is constant in whatever direction it may go.
Ok, så uträkningarna befinner sig på gymnasienivå.
Mr.CORNWELL. How well established are these acoustics principles you have been describing?
Mr.WEISS. These have been established a very long time. They have been known for several hundred years. These are fundamental things in acoustics, the things taught in high school or college undergraduate level physics.
Nix, det gjorde det inte. Bara gymnasiefysik.
Mr. CORNWELL. Were there other more complex or more sophisticated principles that you were required to use in your analysis which were not so well established, which were newer or less well established?
Mr.WEISS. No, Sir. We only needed to apply these basic welltested, well-established principles;nothing more.
The basic principles of echo location are well known; well enough that submarines don't have windows. A submarine navigates acoustically by bouncing sounds off of its environment. The on-board computer calculates the distances and angles to surrounding objects as it moves through the water based on the echo delay time. The algorithms in the computer's sonar software adjust for the vessel's speed and compensates for the temperature of the water. Sound travels slower in polar waters than it does through the warm waters off say, the coast of Cuba. Weiss and Aschkenasy were the ones who wrote those software programs and they now applied the same principles to the patterns on the DPD recording.
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Således kunde så kallade magnum revolvrar eller pistoler/revolvrar som kan avfyra kulor som färdas snabbare än ljudet komma ifråga.
Mr.WEISS. In order todo so,the bullet fired from such a pistol would have had to have left the muzzle at supersonic speed, and so, if indeed there are pistols that fire supersonic bullets, the answer would be yes in such a circumstance. However,to my understanding, most pistols do not fire supersonic bullets.
Mr.FAUNTROY. So that on the basis of your knowledge we would have to identify a pistol that fired that fast before you could conclude that it was probably a pistol or could have been a pistol?
Mr. WEISS. Could have been;that is correct.
Således kunde så kallade magnum revolvrar eller pistoler/revolvrar som kan avfyra kulor som färdas snabbare än ljudet komma ifråga.
Mr.WEISS. In order todo so,the bullet fired from such a pistol would have had to have left the muzzle at supersonic speed, and so, if indeed there are pistols that fire supersonic bullets, the answer would be yes in such a circumstance. However,to my understanding, most pistols do not fire supersonic bullets.
Mr.FAUNTROY. So that on the basis of your knowledge we would have to identify a pistol that fired that fast before you could conclude that it was probably a pistol or could have been a pistol?
Mr. WEISS. Could have been;that is correct.
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