The San Francisco call., 1901-12-15

presses, hoists, keel plate bender, ETC.,
and also for testing.
Steam is used outside the power-house
itself, for steam hammers and heating
The main source of power, however, is
electric. Nearly all machines, except the
special hydraulic and pneumatic and the
steam hammers, which require over five
horsepower, are independently driven by
electric motors. The smaller machines
are belt driven from line shafts, each
having its own motor.
The Power-House.
This is a thoroughly modern, one-story
steel structure, 70 by 100 feet, situated in
the center of the plant 1t is the produc-
ing and distributing point for the differ
ent power systems mentioned above, and
also serves for the salt and fresh water
distribution for drinking and fire pur-
poses, as well as petroleum distribution
for the boilers, blacksmith shop and boiler
The boilers (now being installed) are of
the Heine watertube type and will event.
ually supply all the power used in the
works. They are oil burning, as are also
those upon the locomotive cranes.
The electrical equipment includes:
Two 25O K. w. static transformers, II,
900 to 440 volts.
Two $50 K; w. static transformers, H.
One so K. w. static transformer, 22Oo to
ITO volts.
Two Is K. W. static transformers, 200
Two 10 K. W. static transformers, 44O to
10 volts.
One $50 K w. rotary converter. 1s6 to
All are supplied with the necessary
switches, ammeters, volt meters, watt
meters and other requirements. At pres
ent power is taken from the mains of the
Independent Light and Power Company
at 11,0O0 volts, two-phase, 60 cycles Pro
vision, however, has been made to install
generators which will furnish all the pow
er required
The direct current system is used to
operate all the overhead travelling cranes
and two or three small motors
The alternating current system supplies
power 10 tie remaining motors and the
arc and incandescent lamps
The hydraulic power system is supplied
by a 15O horsepower, triple throw dou-
BILE acting pump, driven by an Induction
motor This pump produces pressure of
15OO pounds per square inch and feeds a
battery OF four accumulators, which ap-
tomatically control the output The pow
er is then distributed through a. system
OF manifolds to the various departments
ood me compressed air is furnished by a
SVO horsepower, two stage, intercooled
compressor, directly connected to a COM
pound Corliss engine. Provision is made
for adding more when required. The com
presSor delivers through a receiver to the
mains at pressure Of 100 pounds per
square inch.
The fresh and salt water systems dis
tIlpute through the manifolds throughout
the plant, the former direct from the
! Spring Valley mains, the latter from a
l6X9xl2 inch Smith-Vaile fire pump which
VIII deliver 100 gallons per minute This
is governed by Metz pump governor, SO
| that it keeps a constant pressure on the
mains. As the salt water is also used for
condensing and sprinkling the grounds the
! pump is constantly in operation, thus be-
| ing ready at all times for emergencies
| By a system of valves the fire pumps can
| be changed over to the fresh water sys-
tenn If necessary, or in case of fire Will
! operate both until the arrival of the city !
engines, when the latter will take fresh
water, leaving the salt water system foI
the shop force.
There is also in the power-house a 100
/ horsepower induction motor driving line
] shaft which operates a blower for the
blacksmith shop fires, an auxiliary all
compressor and an auxiliary hydraulic
/ pump.
Oil System.
The oil system is very complete, crude
! petroleum being the principal fuel
| throughout the works.
The storage tank holds 1000 barrels and
J is surrounded by brick wall 80 by g