from The Century Dictionary and Cyclopedia
- n. A pendulum which makes one oscillation per second of mean time. See pendulum.
Sorry, no etymologies found.
H. Foster's pendulum-experiments, deducing from them an ellipticity for the earth of 1/289 (_Memoirs R.Astr. Soc. _ vii.); corrected for the length of the seconds-pendulum by introducing a neglected element of reduction; and was entrusted, in 1843, with the reconstruction of the standards of length.