Fig. 2 A schematic version of Grienberger's enhanced version of Mario Bettini's enhanced scenographic instrument showing detail of cursores, from Mario Bettini, Apiaria Universae Philosophiae Mathematicae, Bononiae: Io. Baptistae Ferronij; 1645, Apiarium V, Caput VI, p. 45. Engraving. Click on the image for an enlargement.