There were two sets of the reciprocating kind, one working each
of the wing propellers through a four-cylinder triple expansion,
direct acting inverted engine. Each set could generate 15,000
indicated horse-power at seventy-five revolutions a minute.
The Parsons type turbine takes steam from the reciprocating
engines, and by developing a horse-power of 16,000 at 165
revolutions a minute works the third of the ship's propellers,
the one directly under the rudder. Of the four funnels of the
vessel three were connected with the engine room, and the
fourth or after funnel for ventilating the ship including the
gallery.
Practically all of the space on the Titanic below the upper
deck was occupied by steam-generating plant, coal bunkers
and propelling machinery. Eight of the fifteen water-tight
compartments contained the mechanical part of the vessel. There
were, for instance, twenty-four double end and five single end
boilers, each 16 feet 9 inches in diameter, the larger 20 feet long
and the smaller 11 feet 9 inches long. The larger boilers had
six fires under each of them and the smaller three furnaces.
Coal was stored in bunker space along the side of the ship
between the lower and middle decks, and was first shipped
from there into bunkers running all the way across the vessel
in the lowest part.
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