francoisdenis

rightly said ,nothing to add

I agree , following your proposition the bassbar seems to keep the relation between Lb and UB (parallel to the tangent to LB and UB) It is not the common ratio used in violin making (I don't know where you get this ) in other hand you find this specific ratio in the viol making

Anyway I renew my offer If you have a complet and free access documentation to your approach I will add it to my online documentation (under construction)

So using circles... you should say that circles are the basic of your outlines .Why do you state the opposite? What is the issue? What do you want to defend here? You could advantageously take profit that "volute" (or more exactly "scotia" which the form you used actually), are easy to draw which is not the case of the oser curves

Speaking of outlines shapes, your "spiral" is more what the Ancients called a "volute" which means a serie of circles Spirals need a continious change of a radius value what typically you get when you round a rope on a round stick rather than volutes have a discret serie of radius typically what you get when you round a rope around a polyedre shape the spirale is what you get when the polyedres have an infinity of sides

Joaquim I have had the opportunity to collect researches on the violin design made by many authors. If you agree to share a complete description of your work on this forum or directly to me do not hesitate.

We can add to the previous list hanz Kaizer "die Form der Geige. Aus dem Gestz der töne gedeutet " Zûrich 1947. Esperando una explicación completa Joaquin!

may be the frog could help to find a location...

No I didn't read this thread before , interesting indeed, even if at the end the author (probably italian) remains unknown

Does somebody could give me the autore's name of this drawing?

The confusion is easy between the tangency between radii and the tangency of the line with the framework. In fact, theses points can be same or not. I guess that It is on that point that your thinking goes in the wrong direction. Actually, the construction in the vidéo is correct

Dear Nick, what would be the proper scotias for you?

What we call symmetry today covers only a small part of the ancient meaning. In short, "symmetria" meant more a balanced distribution of the elements of a whole (as seen in nature). For example, having two eyes on each side of the nose is a symmetry. It matters little here that the both eyes are strictly the same in their dimensions. This last point is literally off topic.

I have the french edition no idea of any translation

Paul Kaul was an interessting man working not far from my workshop strong defender of the modern violinmaking tireless fighter against the ancient's tyrany. He wrote a rare book (published in 1927) on this topic with some funny anecdocts about competitions betweens ancienst and moderns at the turn of the 19th century.