Sentence:  The reproducibilities of helium vapor-pressure thermometers have been investigated in conjunction with a `` constant temperature '' liquid helium <WSD>bath</WSD> from 4.2 to 1.8 * * f . 
Meaning of the word marked with <WSD> tags:  a vessel containing liquid in which something is immersed (as to process it or to maintain it at a constant temperature or to lubricate it)