Ground (electricity)
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In electrical engineering, ground or earth may be a reference point in an electrical circuit from which voltages are measured, a common return path for electric current, or a direct physical connection to the Earth.
Metal water pipe used as grounding electrode
Busbars are used for ground conductors in high-current circuits.
3 ply static dissipative vinyl grounding mat shown at macro scale
Carl August von Steinheil
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Carl August von Steinheil was a German physicist, inventor, engineer and astronomer.
Reading telescopes by C.A. Steinheil purchased in 1865 on display in the Teylers Instrument Room