Water condensing in the gasholder inlet-pipe falls downwards to the washer.
This provides for the proper level of water in the gasholder.
The gasholder is then emptied down to the zero mark by closing the cock p and opening q.
The gasholder must also bear a plate recording the maker's or seller's name, as well as its storage capacity.
The gas passes from the generating chambers B through the pipe D to the washer-cooler E and thence to the gasholder.
Signal devices to show the position of the gasholder bell must not be capable of producing sparks inside the apparatus house.
The top of this framework is perfectly contiguous with the inside of the crown of the gasholder.
Cocks must be provided for cutting off the main and connexions from the generator and gasholder.
From the gasholder the gas is taken off as required for use by a pipe, the mouth of which is just below the crown of the holder.
The gas passes through a washer in the gasholder tank, and then through an outside scrubber to the service-pipe.