This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
FMIB MillerCasella modification of Six's selfregistering thermometer The large bulb is double with layer of liquid and bell of.jpeg check categories September MillerCasella modification of Six's selfregistering thermometer The large bulb is double with layer of liquid and bell of vapour between the shells to relieve pressure