consisted of an upturned steel bell contained within a large frame that guided it as it rose and fell depending on the amount of gas it contained.

Types of gases produced

The following gases were produced in gas plants, among other things:
* Wood gas, made from wood.
* Lignite gas, instead of using Hard Coal (Bituminous/Coke), Brown Coal (Lignite) was used.
* Coal Gas - Retort Gas - Luminous Gas - City Gas, coal

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