Christophori Clauii Bamb. ex Societate Iesu, in sphæram Ioannis de Sacro Bosco, commentarius.
A 1608 Latin commentary on Sacrobosco's sphere by Jesuit mathematician Christoph Clavius, printed in Paris for scholars and students of astronomy. Its pictures are geometric diagrams of circles, chords, and lettered points drawn in fine line, with the letters labelling each intersection, which a designer might borrow for compass-and-straightedge schematics or technical line work.
