this water-tank the vertical distance is 198 feet. At the western side of
the subterranean railway there is, above the arrival platform, a "lower
booking-hall," or, more properly, a large waiting room, 32 feet square
and 29 feet high, the access to which on this side is by a broad flight
of steps rising 12 feet, and to and from which all passengers on the
departure platform have communication by a lattice bridge 16 feet above
the line of rails. From the western side of this hall the passengers will
have access to the three lifts, and will thence ascend in large ascending
rooms or cages, capable of containing one hundred persons each, to the
upper booking-hall on the ground level of James Street. Intermediate in
height between the lower and upper halls the engine-room for the pumps is
located. From the lower hall also there is provided, independent of the
lifts, an inclined subway, leading up toward the Exchange. In this lower
subterranean chamber there are four doorways, 5 feet wide, three of them
being fitted with ticket gateways, and leading to the three lift-shafts,
excavated in the rock, and lined, where needed, with brick. In each of
these shafts, which are 21 feet by 19 feet in sectional area, a handsome
ascending wood-paneled room, or cage, formed of teak and American oak, is
fitted, its dimensions in plan being 20 feet by 17 feet, and its general
internal height 8 feet; but in the central portion the roof rises into a
flat lantern 10 feet high, the sides of which are lined with mirrors that
reflect into the ascending-room the rays of a powerful gas-lamp. The
foundation of this room is a very stiff structure, consisting of two
wrought-iron special-form girders crossing beneath it, the cross, 14
inches deep, connecting them being of steel, and forged from a single
ingot. The central boss of the cross is 22 inches in diameter, and in
this is bored out a central cavity, into which the head of the steel ram,
18 inches in diameter, is fitted; the ram itself being built up of steel
cylinders or tubes, 11 feet 3 inches in length, which are connected
together by internal screws. There is also a central rod within the ram,