Related Object Info
resistance standard
[On the right] A coil of manganin wire (an alloy made of 86% copper, 12% manganese, and 2% nickel, first developed by Edward Weston in 1892) wound on a tube and covered in paraffin. This part of the instrument is protected by a nickel-plated copper removable cylinder. Two terminals that would be dipped in mercury, connected to the manganin coil, are attached like the rest of the instrument on a wooden base.