Thesis? Not according to Farmer's analysis in his research paper "Was the Arabian and Persian Lute Fretted" in trying to explain why there is not one
example of a fretted lute depicted in the iconography from the year 1300 onwards (and so was obviously unaware of the existence of the oud engraving,
subject of this thread).
His conclusion was that use of frets had already fallen into general disuse by the 14th C although the authors of the surviving theoretical works such
as Quth al-Din al- Shirazi (early 14th C), Muhammad al-Amuli (14thC) and Ibn Ghaild (early 15th C) all continue to mention frets.
So, of course does, Safi al-Din who died at the end of the 13th C.
Farmer scorns researcher Baron Carra de Vaux for daring to suggest that Safi al-Din's oud had 5 double courses based on a fretting tablature that
appears in a single example of a manuscript copy of Safi al-Din's other great work the "Risalat al-sharafiyya" where double lines had been drawn by
the copyist to depict the strings. Clearly, Farmer might have been persuaded otherwise if he had been aware of the oud engraving - and he cannot have
overlooked it as he examined seven copies of both books without finding another example of the double lined tablature (or the oud engraving).
The oud engraving in the Kitab al-Adwar may, therefore, have been a unique addition by the early 14th C copyist of the manuscript.
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