New-York tribune., 1920-04-12
Secrets of Navv i'm
War. on View at
Marine Exposition
Show That Opens Tonight in
Grand Central Palace Will
Include the Paravane, Foe
of Hidden Moored Mines

Navy devices which have been kept
secret are included in the extensive dis-
play the Navy Department will have
at the National Marine Exposition,
which opens tonight in Grand Central
Palace.
Secretary Daniels announced in
Washington yesterday that the exhibit
Will include models showing the evolu-
tlon of naval vessels, some Of the wars
developments in ordnance, a special ex-
hibition by the 9Th Regiment Of Ma
rlnes and full-sized paravane. one Of
the wars most carefully guarded inven-
elons, which is being shown for the first
time to the public. The ship models to
be shown include the following:
The Holland, the first submarine in
che American navy; submarine So, the
latest model of submersble in the
navy, and the Maintonomah, represent
ing the old monitors authorized at the
time of the Civil War.
Two Vermonts Contrasted
The Vermont. one of the old "clip-
per' ships, showing all the rigging of
the masts identically as this vessel op-
Grated many years ago. and the present
battleship Vermont.
Model or the Connecticut, one-half
shown in section and the other half
a full model, by which can be seen
the various quarters, machinery, ammu-
milton hoists, etc.
The Maine, showing the famous bat
tleship as she appeared before her de-
struction in Havana Harbor.
The battleship Wyoming and the bat
tieship pennsylvania, one Of the new
dreadnoughts.
The torpedo boat Mccall, a sub chas-
or, mine sweeper, an Eagle boat and
the auxiliary yacht Corsair.
another interesting showing will he
that OF twenty-five small models of
various vessels Of the navy and mer-
chant marine, showing the application
OF the camouhage used during the war
Ordnance material to be shown in
cludes: A triple torpedo tube taken
from one Of the new destroyers, with
one OF the latest type torpedoes, and
antl-alrcraft guns, shells ranging from
t-pounder to 16-inch and samples Of
powder charges for each, together with
depth charges, automatic guns and mn
chino guns. ~'' A'1 '''''-
Wireless Display To Be Extensive
There will be exhibited a complete
outfit showing radio telephone. radio
compass. sound signaling devices and
dircraft equipment; also a clay relief
model Of the water front Of the State
OF New York, revealing the use Of the
radio stations and the means of signal
ing vessels to give them their direct
All information concerning para
vanes was kept strictly confidential
during the war. This is an English
invention, used to protect vessels from
moored mines, which was adopted by
the United States upon entering the
war. Paravanes are towed from a sker
fitted on the forefoot of the vessel
about on level with the keel and run
thirty to forty yards out from tho
center line, being held away from the
ships side by the action of the water
on a plane which is set at slight
angle with the body of the paravane.
The depth at which the paravane
travels is governed by the rudder in
the tail, which is controlled by hy-
drostatic valve and spring. The mine
mooring when caught by the paravane
towing rope is dragged into the saw.