Tensas gazette. [volume] (St. Joseph, La.) 1886-current, 1915-12-10
Federal Department Discards
Sounding for Dragging Sys-
tenn to Root Up OBJ
stacIeS.
ARE DIFFICULT TO LOCATE
A Pinnacle Rock 10 Like an Undersea
Dagger to a ship-LegaI lmpor-
lance Of Having Dangerous Rocks
charted Cannot Be Over
estimated.

Washington.-If an aviator few over
New York some dark night, plumbing
for the Woolworth tower with an or
binary sounding line, he'd have just
as much chance of locating the build
ing as the photographic experts OF the
department of commerce have in locat-
ing pinnacle rocks from ten to thirty
feet under the surface Of the water by
using the same method. Accordingly.
the department is no longer sound.
ing" for pinnacle rocks; 1t is drag
ging" for them.
Pinnacle rocks are one of the grav-
est menaces to navigation that exist
in the coastal waters of the United
States. New England has the most
abundant crop of any locality and the
coast of that section Is probably the
hardest to chart of any American
coast. With the new drag" method
in operation, however. charting of pin
nacle rocks is becoming an easy mat.
ter.
Not only is q pinnacle rock extreme
ly dangerous to navigation, but 1t is
extremely difficult to locate. A pin.
nacle rock is exactly what its name
implies. It is q tall. rocky pinnacle
which rises straight from the bottom
of the ocean and often the area of its
top surface would not be ten square
yards. When vessel strikes one,
though, q pinnacle rock is like nothing
30 much as an undersea dagger.
Speed Was the Thing.
Years ago, when the coasts of the
United States were first charted, II
was necessary to make as much speed
as possible and cover the greatest pos
sible territory in the shortest possible
time. Under such conditions the
plumbing of coastal localities with q
sounding line and the determination Of
shoals by consideration of the general
characteristics of the locality were
necessary. but these surveys left many
uncharted pinnacles behind. to bring
disaster to ships later on.
They tell a story of a pinnacle roct
incident that occurred on one Of
Peary's trips to Greenland. back II
the late nineties. Peary's ship wa.
holding a straight course for Green
land. but owing to the cloudiness o.
the weather a lookout was posted. Thu
routine of the ship was suddenly dis
turbed by the cry Of the lookout
Breakers dead ahead!" The helms
man spun his wheel and the shiI
heeled sharply to port. just in time t.
| escape a sunken rock which was abou
three feet under water. Had it no
been for the lookout Peary nigh
never have reached the pole.
The department of commerce hal
been aware for long time of the lacl
Of authentic charts of many portions
of the American coast. and the DANCE
of pinnacle rocks was the real reason
why the old plumbline system was dis
carded for the wire-drag method
which is very much similar to the old
fashioned seine. g.
A line is run between two motto
boats, several hundred yards apart
This line Is supported ON the water b.
floats, but suspended from it are othe
lines, all attached to a long wire. ur
der water. which IL held down b.
weights. The wire under water col
responds exactly to the lower edge o
q seine.
Motor Boats Active.
The motor boats are started Harvard
keeping an even distance apart. Tn
bottom wire is far enough under waite