Making the far near The invention that set the stage for the ... "objective" lens—the convex lens at the far end of the telescope—Galileo ground a lens larger than he needed, for example.

Here, Galileo took this crude device with ... to overcome the problem of chromatic aberration: the invention of the reflecting telescope described by James Gregory and built in a different form ...

The virgin and the telescope: the moons of Cigoli and Galileo Sara ... Replication or monopoly? The economies of invention and discovery in Galileo's observations of 1610 Mario Biagioli Appendix: A ...