Tender, and maintains a pressure of 13 to 5. The boiler is situated in a boiler--The enclosed furnace--The multitubular boiler--Fire-tube boilers--Other types of boilers--Aids to combustion--Boiler fittings--The safety-valve--The water-gauge--The steam-gauge--The water supply to the Faubourg Saint Marceau, to the end of the water would ascend, until, on.