Hothouse fireplaces

2106. The hothouse fireplace, or furnace, consists of several parts: a chamber, or oven, to contain the fuel, surrounded by brickwork, in which firebricks (bricks containing a large proportion of sand, and thus calculated by their hardness not to crumble by heat, &c.) are used; a hearth or iron grating, on which the fuel is laid; a pit or chamber in which the ashes drop from this grating; and iron doors to the fuel-chamber and ash-pit.