- Picture nr. 1 : Christoph Weigel: "Der Saitenmacher", Regensburg 1698.

- Picture nr. 2 : Giovanni Pietro Pinaroli "Polyanthea Technica ..." Rome 1718-32, tab. 1

- Picture nr. 3 : Giovanni Pietro Pinaroli "Polyanthea Technica ..." Rome 1718-32. tab. 2

- Picture nr. 4 : Giovanni Pietro Pinaroli "Polyanthea Technica ..." Rome 1718-32, tab. 3

- Picture nr. 5 : Diderot & Alambert's "Encyclopedie", Paris 1750-67

- Picture nr. 6 : 19th C. stringmaking (courtesy of Frank Smith,UK)

- Picture nr. 7 : 19 th C. stringmaking (courtesy of Frank Smith,UK)

- Picture nr. 8 :  Skippon's description of the string- frame of a paduan stringmaker (2nd half of the 17th C)