from The Century Dictionary.
- noun A chamber connected with the steam-space and projecting above the top of a steam-boiler.
Sorry, no etymologies found.
At first the fire had burned fitfully, eating its way into the small economies; as when the section hands pelt stray dogs with new spikes from the stock keg, and careless freight crews seed down the right of way with cast-off links and pins; when engineers pour oil where it should be dropped, and firemen feed the stack instead of the steam-dome.
Fortunately he fell between the funnel and the steam-dome, which was the means of savin 'his life; but he got a bad shake, and was off duty some six or eight weeks.