On that diagram, the distance from G(open) to A is c25mm, with G-G# and Ab-A c10mm. G#-Ab is c5mm. The book that reproduced the Prelleur chart gives no indication of whether the original was fingerboard size, and I don't have a full size violin in the house to check.

Interestingly, a few pages further on there is the Extended Meantone Fifth "Spiral" which starts at Fb, laps itself at E, and finishes at B#