steam boiler

A steam-boiler had been obtained, and preparations had been made to build other houses.

What the open door of the ash pit is to the furnace of a steam-boiler the open street door is to the house on fire.

In a steam-boiler the burning fuel is enclosed either by fire-brick or a "water-jacket," forming part of the boiler.

This is probably the earliest record of a steam-boiler explosion.