tangent galvanometer

Anyone got a picture of a dip circle or a tangent galvanometer?

A tangent galvanometer is an early measuring instrument used for the measurement of electric current.

One problem with the tangent galvanometer is that its resolution degrades at both high currents and low currents.

A tangent galvanometer can also be used to measure the magnitude of the horizontal component of the geomagnetic field.

A tangent galvanometer consists of a coil of insulated copper wire wound on a circular non-magnetic frame.

The tangent galvanometer was used to measure currents using this effect, where the restoring force returning the pointer to the zero position was provided by the Earth's magnetic field.

He improved precision measuring instruments and developed numerous measuring methods in almost all of the fields of physics known during his lifetime, including a reflectivity meter, a tangent galvanometer, and various types of magnetometers and dynamometers.

For example, he assisted the physicist James Prescott Joule with the development of scientific instruments such as an apparatus for measuring the internal capacity of the bore of thermometer tubes, a tangent galvanometer, and other devices useful in Joule's research.