pneumatic trough

noun

, Chemistry.

a trough filled with liquid, especially water, for collecting gases in bell jars or the like by displacement.

pneumatic trough

chem a shallow dishlike vessel filled with a liquid, usually water, and used in collecting gases by displacement of liquid from a filled jar held with its open end under the surface of the liquid

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First recorded in 1820–30

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A glass tube brings it into communication with a bell jar full of water on the shelf of the pneumatic trough.

A weighed amount of oxide of silver is placed in a glass tube connected with a pneumatic trough.

The vessel C (Fig. 4), containing the water in which the bottles are inverted, is called a pneumatic trough.

The gas comes over in large quantities, and must be collected in a gas jar, or the pneumatic trough.

Carbonic acid is rapidly evolved, and may be collected, with some loss, over water in the pneumatic trough.

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