Development of Gravity Pendulums in the 19th Century :
Multhauf, Robert P., 1919-2004
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 [electronic resource] / Robert P. Multhauf - Project Gutenberg, 2011 - Project Gutenberg 35024 .
Public domain in the USA.
Electronic text
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 [electronic resource] / Robert P. Multhauf - Project Gutenberg, 2011 - Project Gutenberg 35024 .
Public domain in the USA.
Electronic text