Figure 53. The Miller-Casella modification of Six's self-registering thermometer . The large bulb is double with a layer of liquid and a bell of vapour between the shells to relieve pressure. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Image ID: expl3226, Voyage To Inner Space - Exploring the Seas With NOAA Collect
Credit: NOAA Central Library Historical Collections

• High Resolution Photo Available