Andy....from a previous
disjointed thread....

...the tanks are listed each as 100 gallon F/W which would be assumed as for drinking and not toilet flushing
I understand acetylene gas lamps [by-product of Carbide fuel plant] were used in early Australian Paddlers, and some with dire consequences of shipboard fire

...however I cannot find any visual references to such plant
This domed component is certainly a little elusive in understanding
Ilhan.......having disjointed threads requires looking backwards to find other postings via different threads
Grouping all of your research under
one main thread really helps
Derek