Galileo Galilei, Disorso Al
Serenissimo Don Cosimo II
(Firenze, 1612).
Galileo Galilei, Istoria e
Dimonstrazioni (Rome, 1613).
Galileo Galilei, Tractatus de
Proportionum instrumento, 2nd
edition (Argentorati, 1635).
(This text is the source for the
image this week.)