Bimetallic-Coil Thermometers This page first published: Aug 13, 2004 · Modified: May 10, 2018 · by Randal Oulton. Copyright © 2020 · This post may contain affiliate links · This blog generates income via ads · Bimetallic-Coil Thermometers have a coil in them made of two different metals, which expand at different rates. This causes the coil also to expand, thus moving a dial.
