A gas bottle (or bulb), to hold the gas collected.
* A way to support the gas bottle or bulb, such as a beehive shelf or a hanger (as with Stephen Hales' design).
* A liquid in the trough.

Liquid

Pneumatic troughs require a liquid such as water. Scientists also have used mercury in pneumatic troughs, but usually only for the collection of water-soluble gases. Health and safety issues surrounding mercury generally prohibit its use

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