 OSA Instrument SectionA Superior Electric Pendulum; and Some Pendulum EquationsOSA Publishing JOSA Volume 8 Issue 6 Page 767A Superior Electric Pendulum; and Some Pendulum EquationsWalter P. White, Instrument SectionA Superior Electric Pendulum; and Some Pendulum Equations, J. Opt. Soc. Am. 8, 767-782 1924 