The usual Hope apparatus was used with thermo-junctions of iron and constantan replacing the thermometers. The advantage of this method over thermometers is apparent for demonstration purposes as the students can actually watch the temperature change by observing the deflection of a reflecting type galvanometer.
Proceedings of the Iowa Academy of Science
©1944 Iowa Academy of Science, Inc.
Gale, Grant O.
"A Simple Demonstration of the Maximum Density of Water,"
Proceedings of the Iowa Academy of Science, 51(1), 349-349.
Available at: https://scholarworks.uni.edu/pias/vol51/iss1/37