id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
hindsight-22458	Goss, David	Book Review: Galileo’s Telescope	2016	2	.pdf	application/pdf	664	33	57	Before Kepler published his geometrical optics book Dioptrice (1611), Galileo had combined elementary optical knowledge from books such as Giovan Battista Della Porta’s Magia Naturalis (1589) with empirical methods learned from spectacle makers to improve the performance of the spyglass to the point that it became a useful astronomical instrument. This latter difficulty may have been due to the fact that Galileo appeared to have reserved his best telescopes for himself and various Roman prelates rather than providing them to other scientists who were not able to make telescopes of the quality that he did.	cache/hindsight-22458.pdf	txt/hindsight-22458.txt