In the electronic instrument industry a company named Foxboro
had a line of indicators that had a wire to drive the pointer
needle on an indicator. The wire would contract when heated by
electric current. I believe the wire was called Nitonal.
As memory serves, nitinol is a “memory metal”. Upon hating, it
doesn’t contract, but returns to it’s original position.
Bruce D. Holmgrain
Maryland’s first JA Certified Senior Bench Jeweler