On the other hand, when a needle skips and creates an overdub on a recording, it leaves evidence. The NRC analyzed the recording and found no evidence that the needle skipped. So your explanation of the timing fails.
What recording?
Now let's look at the data you are relying on for this (you can find this graph in the
BBN report):
[imgw=350]http://www.internationalskeptics.com/forums/picture.php?albumid=1151&pictureid=11793[/IMGw]
To argue for continuous recording, we have to be confident that the way they chose to separate the data is correct,
Do you in any way dispute their selection of data?
and we have to be confident on the slopes of the lines.
The slopes = coifficients. Not?
You can see from the graph itself that there is a lot of room for error.
No, it isn’t. Show me if the data and/or the calculations are faulty.
For example, we could easily draw a much shallower line for the period 12:28 to 12:34 that fits just as well as their lines.
Are you serious? Claiming the coifficient was, like, ”eye balled” on to the diagram?
Regarding the data points, BBN themselves say this:
"Note that the clock used by the Dispatcher is read out only in full minutes, and occasionally there is more than one annotation for the same minute."
Considering the issue is at most a 1-minute difference, this is a clear problem.
Yes, that is why they did a linear regression analysis, in order to see how much ”dead air” it was on the recording (cha-2). The very steep coifficient after the shooting sequence shows there is very little if any dead air the first six minutes after the shooting and none (negligent) the first two minutes.
Bowles gives a more detailed description of the time data.
"A master clock on the telephone room wall was connected to the City Hall system. This clock reported "official" time. Within the dispatcher's office there were numerous other time giving and time recording devices, both in the telephone room and in the radio room. Telephone operators and radio operators were furnished "Simplex" clocks. Because the hands often worked loose, they indicated the incorrect time. However, their purpose was to stamp the time, day and date on incoming calls. While they were reliable at this, they were not synchronized as stated in the Committee report. Therefore, it was not uncommon for the time stamped on calls to be a minute to two ahead or behind the "official" time shown on the master clock. Accordingly, at "exactly" 10:10, various clocks could be stamping from 10:08 to 10:12, for example. When clocks were as much as a minute or so out of synchronization it was normal procedure to make the needed adjustments. During busy periods this was not readily done. "
To summarize:
The recording was made on a device that by design sometimes stopped recording.
Yes, and you have to show that this in any significant way makes the timing of the five rifle shots detected by BBN and confirmed by W&A impossible.
On top of that you have to show why the Fisher cross talk, closest to the shooting, is not sufficient evidence of correct timing of the five shots sequence on the dictabelt recording.
No time at all for accumulated dead air = in sync.
An analysis of the actual recording itself shows no evidence of needle jumps to explain any time differences.
What recording?
The synchronization data is not nearly precise enough to identify a 30 second gap during the relevant time.
But it is NRC who have to show that the 59 seconds is ’countered’ with ’dead air’ in the cha-2 recording.
The conclusion that Channel II did not record continuously is the much better supported conclusion here.
No one is arguing against cha-2 not recording continuosly. The argument is against that it stopped recording the first minutes after the shooting and did so during a significant period of time.
1. Linear regression analysis says it did not.
2. Common sense = turbulent radio traffic during from the end of shooting = no dead air.
"May have been continuous" does not equal "was."
The RNC (and you) are making the claim that the Decker cross talk proves that the five impulse patterns had to have been recorded a minute after the actual shooting and therefore refutes the acoustic evidence of five rifle shots during the actual shooting.
Are you now reformulating this ”prove” to a ”may”?
The more detailed and precise analysis by NRC is more reliable here.
Why?
The BBN was only trying to show the data was consistent with their timing, which it is because it is consistent with a huge range of timings.
The issue is still if NRC’s refutation is correct. Have they shown that BBN/W&A couldn’t possibly be right in claiming five rifle shots on the dictabelt during the actual shooting?
The details are in "Epipolar Geometric Analysis of Amateur Films Related to Acoustics Evidence in the John F. Kennedy Assassination." By finding points of synchronization across several films, we can determine when McLain actually reached Elm Street. For one, the Dorman film shows him arriving there, and comparison to other films shows it was after the assassination ended.
How does Myers know it’s McLain in the Dorman film?
Another, synchronization with the Hughes film shows he would have needed to drive 200 mph to get to where the HSCA concluded he was during the first shot.
He state this with unsupported asumtions:
1. He starts his counting from a faulty timeline.
2. There is NO information available on where Hughes was standing during the filming. Move him a couple of meters to the north and Myers 200 mph collapses to a modest 20 mph.
3. He analyses the speed of the vehicles in the motorcade as carts in a train with static gaps in between, when the correct movements is more like an accordion, very crowded at the end of a straight road and the opposite at the other end where they are speeding to catch up.
So, yes, it was ample time for McLain to reach the area where his stuck mike picked up the sound from the first rifle shot.
The PDF of the report contains images of all films showing the synchronization. It is better than the video at presenting the evidence.
Yes I know, and no, it doesn’t matter if Myers are using fancy words for his spectacle, it is still severely flawed.