[split] Jorge's Retracer Thread: darker ink, retracing of text and drawings

[Jorge_Stolfi]

Meanwhile, here are some hallucinations of mine over f86v3, traditionally nicknamed "T-O Map and Garden of Eden"(?!?).  First, the "map" itself:

   

    Based on trace densities and other clues, on this page there seem to be at least a general restoration pass (Rt1) and a limited retouching pass (Rt2), in addition to the original ink traces (Rt0).
   
    This clip spans the central diagram of page f83v3. It consists of a circle C1 divided into three unequal parts by two simple lines L1,L2.
   
    The circle is very close to circular and is mostly drawn with a compass, with a thin (~0.1 mm) and faint  trace, with occasional dots and dashes of ink, assumed original (Rt0). However at 11:00 there is a  sharply delimited ~2 mm arc that is hand-drawn with slightly wider trace (~0.2 mm) with ink similar to the text ink; presumably Rt1.
   
    Unlike the circle, the lines L1 and L2 seem to be hand-drawn, as they deviate irregularly from straight.   Both are in Rt1 ink, ~0.21 mm wide, with no visible trace of Rt0 underneath. Line L1 is roughly diameter of the circle, titled ~8° clockwise from WE, and L2 is roughly  north-pointing radius, almost but  not quite perp to L1. They meet ~0.5 mm away from the circle's center.
   
    The diagram seems to be incomplete.  In the original version (Rt0) it may have been just an empty mechanical  circle C1. Lines L1 and L2 may have been spuriously added by the first general restoration pass (Rt1). This diagram is usually called a "T-O map", but it is very different from usual Medieval T-O maps: the latter have the big sector at the top, the dividing lines are doubled (with the space in between representing the Mediterranean), and the three sectors are labeled "Asia", "Europe", and "Africa".
   
    (A) Original (Rt0) mechanical circle.
   
    (J,K) Parts of the circle hand-retraced by Rt1. (L) The L1 line starts deviating from straight  at this point. (M)  Premature end of  L1. (N) The radial L2 line deviates from straight between these points.
   
    (X) Exact reference circle concentric with C1 but ~1 mm away from it.

Let's try f8r

Thanks, will do!  I have already obtained the MS images and converted them to a saner file format.  Just let me get this and the next hallucination out of the pipeline.