Meaning of pneumatic trough in English:
pneumatic trough
noun
ChemistryA shallow liquid-filled container with which gases can be collected by displacing liquid from a jar inverted in the trough.
- ‘The invention of the pneumatic trough, a device for collecting gases emanating from heated substances, by the English clergyman Stephen Hales in the early part of the century, was pivotal for bringing about this emphasis.’
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