Other Gas-Works Facilities
From the retort, the gas would first pass through a tar/water "trap" (similar to a trap in plumbing) called a hydraulic main, where a considerable fraction of coal tar was given up and the gas was significantly cooled. Then, it would pass through the main out of the retort house into an atmospheric or water-cooled condenser, where it would be cooled to the temperature of the atmosphere or the water used. At this point, it enters the exhauster house and passes through an "exhauster", an air pump which maintains the hydraulic mains and, consequently, the retorts at a negative pressure (with a zero pressure being atmospheric). It would then be washed in a "washer" by bubbling it through water, to extract any remaining tars. After this, it would enter a purifier. The gas would then be ready for distribution, and pass into a gasholder for storage.
Read more about this topic: History Of Manufactured Gas, Appliances and Machinery of The Historic Gas-works
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