Originally posted by David Orsam
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Some comments from me about the paper issue.
One of the most pertinent questions asked earlier in this thread was: which Ripper letters are supposed to have been written by Sickert according to Cornwell? More to the point: which Ripper letters are supposed to forensically match the stationery used by Sickert? I don't think these questions have ever been properly answered in this thread. It's not very easy to work it out even when you read Cornwell's book. The letter with coffin and skull identified by Fisherman in #92 & #96 as coming from a 24 paper stack is not, I think, one of the letters forensically linked to Sickert.
I will attempt to answer these questions later in this post but first I have a few issues with Cornwell's general approach.
Apparently, 392 letters and envelopes supposedly written by the murderer were forensically examined on Cornwell's behalf, of which 59 were found to have watermarks. Now, by my count, Cornwell identifies 14 letters (with 5 different types of watermarks) which match watermarks known to have been used by Sickert.
So my first question would be: what does Cornwell say about the circa 45 letters with watermarks not known to have been used by Sickert? Can we rule them out as being Sickert letters on the basis that he did not use such stationery?
And what about all the hundreds of letters without watermarks? Shouldn't we be concluding that these were not by Sickert? Cornwell certainly does not do this and, in fact, she says she believes that 'the majority' of the Ripper letters in the National Archives were written by the killer (i.e. Sickert).
Cornwell tells us that there were some 1,200 different watermarks in use in the late 1880s with some paper makers producing over 100 different varieties but she doesn't tell us which were the most popular types of paper, which must make a difference to the results. I can't work out if the fact that Sickert is known to have used five different types of watermarked stationery increases or decreases the likelihood that Ripper letters would be found with those same watermarks.
The five types of watermarks used by Sickert in the 1880s according to Cornwell were these:
1. Joynson Superfine
2. A. Pirie & Sons
3. Monckton's Superfine
4. Brookleigh Fine
5. Gurney Ivory Laid
It is the Gurney Ivory Laid paper where Cornwell feels that her expert has found a precise forensic match with Sickert's stationery. But let me deal with each of these in turn.
Joynson Superfine
We are not given much information about the "several Ripper letters" which Cornwell tells us are on this paper. One, we are told, was sent to the City of London police. And two letters signed 'Nemo' are on this paper but it's not clear if 'Nemo' was claiming to be the Ripper.
A. Pirie & Sons
There are 3 letters on this watermarked paper. One being the Dr Openshaw letter of 29 October 1888 and the other two both being dated 22 November 1888, one claiming to be from Manchester, the other, says Cornwell, coming from East London which, by a process of elimination, I take to be a letter which starts "I do larf when I hears you have cort me I shall do for two more next Saturday..."
Monckton's Superfine
All we have here is a single letter sent to the City of London police in the LMA archive, from a different batch used by Sickert.
Brookleigh Fine
Two Ripper letters at the National Archives are said to be written on this paper but no details are given.
Gurney Ivory Laid
This is the crucial paper. Cornwell's expert has found two letters which can be forensically matched to the same quire of paper used by Sickert.
The first of these is a Ripper letter received by the City of London police on 4 October 1888 which has "doodles and three cartoonish faces on it". No more details are provided (possibly because Cornwell is not allowed to reproduce letters from the LMA archive).
The second is a letter postmarked 31 October 1888. All Cornwell tells us about the letter is that it commences "Dear Boss, I am living 129 C Rd...". She rather coyly cuts it short at this point but we learn from Evans & Skinner's Letters from Hell that this letter was addressed to Old Street police station and said:
"Dear Boss,
I am living in 129 C Rd...and I mean to do another murder in PEN Rd to night
Yours truly
Jack the ripper"
As we can see it's such an innocuous letter that it's hard to see why someone with Sickert's obvious creative ability would have bothered with it, even if he was trying to hoax the police. Certainly it's not a very convincing example of him as the murderer because there weren't any murders committed on 31 October.
We don't get very many details of the forensic match between these two letters and three of Sickert's letters which are supposed to come from the same small batch. But apparently the matches are in the short-edge cuts, fiber analysis, wire profile of forming surface, weight, bulk and opacity of the sheet and surface finish. Cornwell quotes her expert Peter Bower saying "One can only assert that two sheets come from the same batch if everything matches" but she does not actually quote Bower as saying that everything matches although she tells us herself that they do. Well I don't suppose she is making that up but it's a shame we don't hear it in Bower's own words. It worries me that we are not told if there were any control samples used. No report from Bower is included so we don't really know if there are any caveats to his findings or if we are looking at a 100% certain match of the paper.
I have no good scientific reason to doubt the expert findings but it's just that the 31 October letter is so dull that it's hard to conceive why an imaginative person like Sickert would have written it (either as a hoax or because he was the murderer).
Certainly if he was the murderer he must surely have written the Dear Boss letter of 25 September. I say this because it is inconceivable that the killer would have adopted the name "Jack the Ripper", as well as the use of the expression "Dear Boss", used by someone who he would have known was a hoaxer. Yet not only does Cornwell not tell us that there is any forensic match between the 25 September letter and any Sickert letters but I find it very odd that having caused such a sensation when this letter was published at the start of October, the Ripper was happy to write letters which were ignored and likely to be ignored. Why would he not have written subsequent letters in the same handwriting to prove that they were genuine? Why would he not have written to the same person at the Central News Agency? Why, as with the 31 October example, write to Old Street police station? Why not include details which only the killer could have known? Why, to repeat, would he have written such low impact letters?
It's strange that it is only what one might term 'minor' letters that are able to be connected to Sickert which, other than some supposed cartoonish characters on one of the Gurney Ivory letters, don't seem to contain any artwork, let alone good artwork.
On the basis of the very minimal information given in the book about the forensic matching I personally remain sceptical that Cornwell has managed to prove that Sickert wrote any Ripper letters but can't refute the possibility that she has done.
One of the most pertinent questions asked earlier in this thread was: which Ripper letters are supposed to have been written by Sickert according to Cornwell? More to the point: which Ripper letters are supposed to forensically match the stationery used by Sickert? I don't think these questions have ever been properly answered in this thread. It's not very easy to work it out even when you read Cornwell's book. The letter with coffin and skull identified by Fisherman in #92 & #96 as coming from a 24 paper stack is not, I think, one of the letters forensically linked to Sickert.
I will attempt to answer these questions later in this post but first I have a few issues with Cornwell's general approach.
Apparently, 392 letters and envelopes supposedly written by the murderer were forensically examined on Cornwell's behalf, of which 59 were found to have watermarks. Now, by my count, Cornwell identifies 14 letters (with 5 different types of watermarks) which match watermarks known to have been used by Sickert.
So my first question would be: what does Cornwell say about the circa 45 letters with watermarks not known to have been used by Sickert? Can we rule them out as being Sickert letters on the basis that he did not use such stationery?
And what about all the hundreds of letters without watermarks? Shouldn't we be concluding that these were not by Sickert? Cornwell certainly does not do this and, in fact, she says she believes that 'the majority' of the Ripper letters in the National Archives were written by the killer (i.e. Sickert).
Cornwell tells us that there were some 1,200 different watermarks in use in the late 1880s with some paper makers producing over 100 different varieties but she doesn't tell us which were the most popular types of paper, which must make a difference to the results. I can't work out if the fact that Sickert is known to have used five different types of watermarked stationery increases or decreases the likelihood that Ripper letters would be found with those same watermarks.
The five types of watermarks used by Sickert in the 1880s according to Cornwell were these:
1. Joynson Superfine
2. A. Pirie & Sons
3. Monckton's Superfine
4. Brookleigh Fine
5. Gurney Ivory Laid
It is the Gurney Ivory Laid paper where Cornwell feels that her expert has found a precise forensic match with Sickert's stationery. But let me deal with each of these in turn.
Joynson Superfine
We are not given much information about the "several Ripper letters" which Cornwell tells us are on this paper. One, we are told, was sent to the City of London police. And two letters signed 'Nemo' are on this paper but it's not clear if 'Nemo' was claiming to be the Ripper.
A. Pirie & Sons
There are 3 letters on this watermarked paper. One being the Dr Openshaw letter of 29 October 1888 and the other two both being dated 22 November 1888, one claiming to be from Manchester, the other, says Cornwell, coming from East London which, by a process of elimination, I take to be a letter which starts "I do larf when I hears you have cort me I shall do for two more next Saturday..."
Monckton's Superfine
All we have here is a single letter sent to the City of London police in the LMA archive, from a different batch used by Sickert.
Brookleigh Fine
Two Ripper letters at the National Archives are said to be written on this paper but no details are given.
Gurney Ivory Laid
This is the crucial paper. Cornwell's expert has found two letters which can be forensically matched to the same quire of paper used by Sickert.
The first of these is a Ripper letter received by the City of London police on 4 October 1888 which has "doodles and three cartoonish faces on it". No more details are provided (possibly because Cornwell is not allowed to reproduce letters from the LMA archive).
The second is a letter postmarked 31 October 1888. All Cornwell tells us about the letter is that it commences "Dear Boss, I am living 129 C Rd...". She rather coyly cuts it short at this point but we learn from Evans & Skinner's Letters from Hell that this letter was addressed to Old Street police station and said:
"Dear Boss,
I am living in 129 C Rd...and I mean to do another murder in PEN Rd to night
Yours truly
Jack the ripper"
As we can see it's such an innocuous letter that it's hard to see why someone with Sickert's obvious creative ability would have bothered with it, even if he was trying to hoax the police. Certainly it's not a very convincing example of him as the murderer because there weren't any murders committed on 31 October.
We don't get very many details of the forensic match between these two letters and three of Sickert's letters which are supposed to come from the same small batch. But apparently the matches are in the short-edge cuts, fiber analysis, wire profile of forming surface, weight, bulk and opacity of the sheet and surface finish. Cornwell quotes her expert Peter Bower saying "One can only assert that two sheets come from the same batch if everything matches" but she does not actually quote Bower as saying that everything matches although she tells us herself that they do. Well I don't suppose she is making that up but it's a shame we don't hear it in Bower's own words. It worries me that we are not told if there were any control samples used. No report from Bower is included so we don't really know if there are any caveats to his findings or if we are looking at a 100% certain match of the paper.
I have no good scientific reason to doubt the expert findings but it's just that the 31 October letter is so dull that it's hard to conceive why an imaginative person like Sickert would have written it (either as a hoax or because he was the murderer).
Certainly if he was the murderer he must surely have written the Dear Boss letter of 25 September. I say this because it is inconceivable that the killer would have adopted the name "Jack the Ripper", as well as the use of the expression "Dear Boss", used by someone who he would have known was a hoaxer. Yet not only does Cornwell not tell us that there is any forensic match between the 25 September letter and any Sickert letters but I find it very odd that having caused such a sensation when this letter was published at the start of October, the Ripper was happy to write letters which were ignored and likely to be ignored. Why would he not have written subsequent letters in the same handwriting to prove that they were genuine? Why would he not have written to the same person at the Central News Agency? Why, as with the 31 October example, write to Old Street police station? Why not include details which only the killer could have known? Why, to repeat, would he have written such low impact letters?
It's strange that it is only what one might term 'minor' letters that are able to be connected to Sickert which, other than some supposed cartoonish characters on one of the Gurney Ivory letters, don't seem to contain any artwork, let alone good artwork.
On the basis of the very minimal information given in the book about the forensic matching I personally remain sceptical that Cornwell has managed to prove that Sickert wrote any Ripper letters but can't refute the possibility that she has done.
I have been looking at much the same issue today and have come to much the same conclusion as yourself.
There are a very few number of letters Cornwall can actually link to Sickert.
And as you say none are obviously of the more shall we say serious type.
I also noted some of the letters she cites are actually only listed as probably from Sickest paper, given the experts comments that all needs to match, it seems clear that these probables do no meet that exact criteria.
I am also disappointed that there are no scientific results included.
My view for what is worth that Cornwall has probably established that some minor letters came from the same stock Sickert was using..
Steve
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