00760cam a2200193 4500 117662810 TxAuBib 20071113120000.0 110121s2011||||||||||||||||||||||||eng|u 35024 Project Gutenberg PGUSA eng TxAuBib Lenzen, Victor Fritz. Development of Gravity Pendulums in the 19th Century Contributions from the Museum of History and Technology, Papers 34-44 On Science and Technology, Smithsonian Institution, 1966 [Gutenberg] / by Victor Fritz Lenzen and Robert P., 1919-2004 Multhauf. Project Gutenberg, 2011. Freely available. Electronic text. Multhauf, Robert P. http://www.gutenberg.org/license Rights CLMPL