Needle on scale of controlled by a spring which is attached to an iron plunger which plunges into a field coil. Used by Weston before his own instrument inventions.
NJIT Robert W. Van Houten Library, Third Floor, Case 11, Shelf B
Overall height 11"
Matthew Brown & Zackary Kellett
Donated by Edward Weston
Ammeter, Electrical, Measurement, Instrument