wing-propellers and the turbine a mid-propeller, making her a
triple-screw vessel. To drive these engines she had 29 enormous
boilers and 159 furnaces. Three elliptical funnels, 24 feet 6 inches
in the widest diameter, took away smoke and water gases; the fourth
one was a dummy for ventilation.

She was fitted with 16 lifeboats 30 feet long, swung on davits of the
Welin double-acting type. These davits are specially designed for
dealing with two, and, where necessary, three, sets of lifeboats,--i.e.,
48 altogether; more than enough to have saved every soul on board
on the night of the collision. She was divided into 16 compartments by
15 transverse watertight bulkheads reaching from the double bottom
to the upper deck in the forward end and to the saloon deck in the
after end (Fig. 2), in both cases well above the water line.
Communication between the engine rooms and boiler rooms was
through watertight doors, which could all be closed instantly from the
captain's bridge: a single switch, controlling powerful electro-magnets,
operated them. They could also be closed by hand with a lever,
and in case the floor below them was flooded by accident, a
float underneath the flooring shut them automatically. These
compartments were so designed that if the two largest were flooded
with water--a most unlikely contingency in the ordinary way--the ship
would still be quite safe. Of course, more than two were flooded the
night of the collision, but exactly how many is not yet thoroughly
established.

Her crew had a complement of 860, made up of 475 stewards, cooks,
etc., 320 engineers, and 65 engaged in her navigation. The machinery
and equipment of the Titanic was the finest obtainable and represented
the last word in marine construction. All her structure was of steel,