Two centuries of shipbuilding by the Scotts at Greenock

Hydraulic and Pneumatic Power. 105
way distributing panels in the various departments. The
motors, of which there are about 130 in the shipbuilding
department alone, are of the two- and four-pole type, partly
or entirely enclosed, and mostly of 10 to 20 electric horse-
power. Arc lamps are used for lighting, but the shops
and offices are also illumined by 16 and 32 candle-power
incandescent lamps. Plugs are arranged at various points
throughout the yard for portable lights, and for connecting
mains for lighting the various ships while being completed in
the docks.
Hydraulic power at 800 lb. pressure is generated by two
high-pressure pumps, with steam cylinders 15 in. in diameter,
and rams 4 in. in diameter. There are separate accumu-
lators for each. The pressure pipes are led underground
throughout the Works to the various hydraulic tools already
referred to.
There are two air compressors for supplying power for
the pneumatic tools. The combined capacity is 1800 cubic
feet of free air per minute. Each has two steam cylinders
6 in. in diameter, working respectively high- and low-pressure
air cylinders 15^ in. and 21^- in. in diameter, the stroke
being 18 in. The hydraulic pumps and the air compressors
are illustrated on Plate XL VIII., facing page 104.
As we have already stated, part of the power generated
in this station is utilised at the engine works, to which we
may now turn our attention.