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An intervalometer is usually a handheld device with a long cord that plugs into a cameraâs auxiliary port. It looks and works very similar to a remote trigger release. The type of intervalometer youâll need depends on your type of camera.
A galvanometer is a type of sensitive ammeter: an instrument for detecting electric current. It is an analog electromechanical actuator that produces a rotary deflection of some type of pointer in response to electric current through its coil in a magnetic field.he deflection of a magnetic compass needle by current in a wire was first described by Hans Oersted in 1820. The phenomenon was studied both for its own sake and as a means of measuring electric current. The earliest galvanometer was reported by Johann Schweigger at the University of Halle on 16 September 1820.