The Pensacola journal. (Pensacola, Fla.) 1898-1985, 1919-11-30

the sections, together with the truss
members incorporated into the side
walls of the dock, form a continuous
truss over the whole length The pro-
portions of the several sections to be
such that each or any section can be
locked on one or two of the other
sections, when necessary for the pur-
pose of repairs or inspection. The
connections between the sections to be
by means of heavy pins. so made that
/, they can be readily disconnected for
self docking purposes. The pumping
of the dock to be obtained by means
of vertical, centrifugal pumps, placed
In the bottom of the sections, on pump
TO each transverse compartment, and
driven by separate motors, one motor
being connected to each pump shaft at
its upper end. Such ballasting of the
! dock as may be required to sink it to
/ the desired level to be accomplished
by pumping water into the dock, the
pumps and valves being arranged for
that purpose. 1t is intended that the
pumps and motors shall be of such
capacity as will raise the dock with a
5,0OO-ton ship in one hour of -continu-
Gus pumping. The operation of the
dock is intended to be controlled by the
dockmaster station on the pier at the
head of the dry dock. The pump motors
house near .dockmaster's station. The
dry dock to be equipped with a water
register system showing the level Of
the water in each of the several COM
partmentS at all times. The indica tors
partments at al times. The indicators
! of said water level to be placed at
| the end of the side walls where they
can easily be observed by the dock
| master. The dry dock also to be
equipped with capstans at each end of
the side walls; a full line of reIeas-
ing bilge blocks operated by chains,
/ which are galvanized, and hand winch
es; and to have solid keel blocks of
hardwood. For teredo (water worn)
/ protection, the sections will be sheath
| ed over the bottom) and up the sides
| to above the loaded water line, with
| two layers of sheathing, each COM
prised of a layer of felt put on with
| tar coating, and covered with double
| thickness of creosoted boards fastened
closely with galvanized nails. The en-
| tire dock to be built of wood similar
| in strength and weight to American
| long pitch pine, with the exception
of bilge anu keel blocks, which are to
| be of hard wood"
| Contract for construction has been
sublet to Aberthaw Construction COM
pany, of Boston, Mass, and is being
handled by their southern branch, a t
Atlanta, Ca. of which n. Mclean Sage
| is manager. c. r. Craig is superin-
tendent of actual construction, and
Benjamin f. kraus is assistant sup
| erintendent.
Entering into the construction of
| this huge dock will be approximately
], 100000 superficial feet of long leaf
| yellow pine; steel castings will total
approximately LAT, 900 pounds; tie rods,
bolts, spikes, washers, round iron,
clinch rings, iron keys, ETC.; will total
| 100000 pounds approximately; the
motors are twenty in number and are
20-HP, 200 volts, 3-phase, 60 cycle,
$50 RPM. Type 19-TBPV, squirrel
cage vertical A. c. Motors, without
pulleys; the pumps are twenty in
number and are to be 10 inch verti-
cal centrifugal closed impeller, single
suction pumps; 175.000 pairs of white
pine wedged for caulking purposes.
Since completion of contract for the
construction of the new dry dock, the
question frequently has been asked
How is 1t possible for a 5,00-ton dry
dock to lift a 9,000-ton vessel ?' This
is easily explained: Tonnage, in dry
dock terms, means a 5,000-ton dock
will lift vessel weighing 5000 tons.
The tonnage, referring to vessels,
means one that is known as a 5000
ton vessel is rated to carry cargo, fuel,
etc., weighing 5000 tons, whereas the
weight of the vessel itself is only about
1000 tons. For example the "Escam-
bia" built at the local ship plant, is
9 ,000-ton vessel, which means that it
boat itself weighs only approximate
lv i 00O The RrIIca docks n