pendulum measurements
121Equatorial bulge — An equatorial bulge is a bulge which a planet may have around its equator, distorting it into an oblate spheroid. The Earth has an equatorial bulge of 42.72 km (26.5 miles) due to its rotation: its diameter measured across the equatorial plane… …
122George Gabriel Stokes — Infobox Scientist box width = 300px name = George Stokes image size = 220px caption = Sir George Gabriel Stokes, 1st Baronet (1819–1903) birth date = birth date|1819|8|13|df=y birth place = Skreen, County Sligo, Ireland death date = death date… …
123Copley Medal — The Copley Medal awarded to Mendeleev in 1905 …
124Damping — Classical mechanics Newton s Second Law History of classical mechanics  …
125Frequency counter — A frequency counter is an electronic instrument, or component of one, that is used for measuring frequency. Since frequency is defined as the number of events of a particular sort occurring in a set period of time, measuring it is usually… …
126Felix Andries Vening Meinesz — Infobox Scientist name = Felix Andries Vening Meinesz box width = image width =150px caption =Vening Meinesz with his gravimeter birth date = July 30 1887 birth place = the Hague death date = August 10 1966 death place = Amersfoort residence =… …
127Joseph Petzval — ( de. Josef Maximilian Petzval; hu. Petzvál József Miksa; sk. Jozef Maximilián Petzval) (January 6, 1807 ndash; September 19, 1891) was a mathematician, inventor, and physicist best known for his work in optics. Petzval studied and later lectured …
128Directional drilling — A horizontal directional drill in operation Directional drilling (or slant drilling) is the practice of drilling non vertical wells. It can be broken down into three main groups: Oilfield Directional Drilling, Utility Installation Directional… …
