EvC Forum: Paleograph, the Curve of Knowns, and the Emperor's Clothes

I've unsuccessfully raised this question on other sites. One reads, for example:

For such an ancient period as that between A.D. 100 and 300 it is of course much more difficult to be confident about the date of a manuscript. There is infinitely less comparative material. Nevertheless we are now in a fairly comfortable position to date papyrus manuscripts according to their handwriting. We do not have to rely on manuscripts of the New Testament only. We have hundreds of papyrus manuscripts of Greek pagan literary texts from this period and again hundreds of carefully written papyrus documents that show the same types of handwriting. These documents are very important for paleographers because they are often exactly dated. As a rule New Testament manuscripts on papyrus are not. A careful comparison of the papyrus documents and manuscripts of the second and third centuries has established beyond doubt that about forty Greek papyrus manuscripts of the New Testament date from this very period. Unfortunately only six of them are extensively preserved.

Even within the period that runs from c. A.D. 100-300 it is possible for paleographers to be more specific on the relative date of the papyrus manuscripts of the New Testament. For about sixty years now a tiny papyrus fragment of the Gospel of John has been the oldest "manuscript" of the New Testament. This manuscript (P52) has generally been dated to ca. A.D. 125. This fact alone proved that the original Gospel of John was written earlier, viz. in the first century A.D., as had always been upheld by conservative scholars.

- see Dating the Oldest New Testament Manuscripts

With regard to C14 dating, however, we find ...

The historical perspective on the development of radiocarbon dating is well outlined in Taylor's (1987) book "Radiocarbon Dating: An archaeological perspective". Libby and his team intially tested the radiocarbon method on samples from prehistoric Egypt. They chose samples whose age could be independently determined. A sample of acacia wood from the tomb of the pharoah Zoser (or Djoser; 3rd Dynasty, ca. 2700-2600 BC) was obtained and dated. Libby reasoned that since the half-life of C14 was 5568 years, they should obtain a C14 concentration of about 50% that which was found in living wood (see Libby, 1949 for further details). The results they obtained indicated this was the case. Other analyses were conducted on samples of known age wood (dendrochronologically aged). Again, the fit was within the value predicted at 10%. The tests suggested that the half-life they had measured was accurate, and, quite reasonably, suggested further that atmospheric radiocarbon concentration had remained constant throughout the recent past. In 1949, Arnold and Libby (1949) published their paper "Age determinations by radiocarbon content: Checks with samples of known age" in the journal Science. In this paper they presented the first results of the C14 method, including the "Curve of Knowns" in which radiocarbon dates were compared with the known age historical dates (see figure 1).

- see The Curve of Knowns

Where is the paleographic/epigraphic "Curve of Knowns" that validates and calibrates the dates (and confidence) found in the first quote?

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