The Seattle post-intelligencer. [volume] (Seattle, Wash. Terr. [Wash.]) 1888-1914, 1892-06-08

of the dock will be of Douglas fir. The hoor
system will consist of 12xl2-inch longi-
tudinals upon the piles, with transverse
timbers Isxi6 inches, spaced feet center
to center. Upon the transverse timpers
will be laid the 3-inch working floor with
open Joints. The brace timbe-s will be
10x14 inches, and the cross caps XXI
inches. The affairs will be IL inches rise
and inches tread. The diagonal tie tim
bers will be 5x1o inches. A timber cop
ing, built up of three timbers, will
be constructed. There will be three
slides on each side, and one at
the end. for sending down materials, and
these will have floors three inches thick.
Clay puddle is to be rammed down behind
the affairs 70 depth of at least two feet
from the lower side of the braces. The
keel blocks, bilge blocks and bilge block
sides will be of oak, and fitted with racks.
KEYS. pawls, slides. chains, etc. All the
timber work is to be put together with the
best quality of refined American iron bolts.
spikes, etc The connection between the
timber body of the dock and the masonry
entrance will be made by an extension of
the concrete in the abutments, and suit
able iron tie bars, to embrace not less than
three of the altar brace timbers. The work
is also to be thoroughly grouted as the
affairs are laid up.
The caisson or floating gate Will be
double ended hull, with an upper deck of
wood main and lower deck OF steel, both
water tight, and two sets of beams without
a deck 1t will be built of steel. The
length over all, at top of waterways, is "a
feet 103s inches: extreme nodded breadth,
t.ra ot tapt Y
treme height, from bottom of keel to top
Of waterway, 50 feet ia inches. The gate
packing will consist of 6x10 inch Gre
osoted fir timber, with rubber packing Sc
cured to it by copper nails, and the exposed
surface of the timber will be covered with
sheet copper or studded with copper
nails. There will be twelve valves and
filling culverts, 20 inches diameter,
for letting water through the
caisson into the dock, and two
sluices 20 inches diameter con-
Meeting the water chamber between the
water tight decks with the harbor for let
ting the water ballast into the caisson.
The steel plates, angles and slopes are to
have minimum tensile strength of Co.
0o0pounds per square inch, an elongation
of % per cent. in inches, and specimens
iIuSt StiUu a COlu DcIuiil5 test Oh DcHulUS
over flat on themselves without sign of
fracture. The rivets are to be of wrought
iron, 80. 900 to $4,000 pounds per square
linen tensile strength. and 5000 pounds
average shearing strength. The bottom
will be filled with concrete, and movable
ballast of pig iron viii! be provided to give
the necessary stability. The caisson will
be fitted with centrifugal pump, driven
by windlass engine, with discharge ca
pacity of 2.5o0 gallons per minute with
the greatest lift.
The pumping plant of the dock will con-
sist of three centrifugal pumps for pump
ing out the dock, with separate and indie
pendent engines, and one centrifugal pump
and engine. The pumps will admit water
on both sides of the disks, which will be
6S inches diameter, with 22-inch suction
and discharge pipes. The engines will
have cylinders 24x25 inches. There will
be six cylindrical, horizontal steel return
tubular boilers, externally fred. They
will be Is feet diameter, is feet long, with
so finch tubes, and CRATES feet long.
The plant is to have u mean discharge
duty of no 600 gallons per minute, with
boiler pressure of 100 pounds per square
inch. The drainage pump will have a
3i-inch runner. with vertical high pressure
engine with cylinders 12x12 inches, and
the suction and discharge pipes will be IA
inches diameter.