Project Gutenberg was the first provider of free electronic books, or eBooks. Michael Hart, founder of Project Gutenberg, invented eBooks in 1971 and his memory continues to inspire the creation of eBooks and related technologies today.Development of Gravity Pendulums in the 19th Century by Lenzen and MulthaufAuthor: Multhauf, Robert P., 1919-2004,Language: English, Class: Q: Science, Release Date: Jan 21, 2011