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Ammeters of this type

Ammeter — Amperemeter redirects here. For the unit of measurement, see Ampere meter. Demonstration model of a moving iron ammeter. As the current through the coil increases, the plunger is drawn further into the coil and the pointer deflects to the right … Wikipedia
British Rail Class 25 — Infobox Locomotive name = British Rail Class 25 powertype = Diesel electric caption = Class 25 locomotive stands on Springs Branch Traction Maintenance Depot at Wigan roadnumber = D5151–D5299, D7500–D7677; later 25001–25327 totalproduction = 327… … Wikipedia
Observer effect (physics) — For other uses, see Observer effect. In physics, the term observer effect refers to changes that the act of observation will make on the phenomenon being observed. This is often the result of instruments that, by necessity, alter the state of… … Wikipedia