This is a fully operational demonstration thermostat with fine silver contacts. The points are adjustable so that both a normally closed and a normally open circuit can be arranged.
The bimetal element can be quickly activated with an ordinary hair dryer. Binding posts on the backside are used for circuit connections.
Wabash Model #GHS-20.
Forensics Lab Supply Number 3178020.
Formerly Grau-Hall Corporation dba Grau-Hall Scientific.
All products shipped from Wabash, Indiana.