New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1850-07-18
The Coast Survey.

Mr. Bache, the Superintendent of the Coast Sur.
vey, has made his annual report TO the Secretary
OF the Treasury. We have not received COPY of
il, but we find a synopsis in the Nepark Daly
AdUeTtiser, from which We gather one or two facts
The report contains a general state ment of the
progress OF the Coast Survey, and OF the pubica.
tion of its results, summary Of the progress dur.
ing the last year the work proposed for the next
fiscal year, with the estimated cost more detail
ed account Of the several operations in each sec.
ton OF the survey, with notice Of the results au
account Of the Office work for the year and an az.
pendix, containing tables occupation Of parties aud
results with reports OF assistants on matters of In
teIest to navigation, lists Of maps, &c.
The magnetic telegraph has given new pre-.
cislon 10 points most needed, and rendered the
Measurement Of an arc Of the parallel an oper.
alton Of the same kind as tina. an arc of the me-
ridian.
Officers Of both the naval and military arms of
the service have been employed ia the work, which
has been simultaneously going on during the last
year in nine sections, extending from Pa.san ma
quoddy, In Maine, to the Rio Grande aud opsrs
tons are commencing in section tenth, comprising
the coast of Oregon
Soundngs have been made off the south side of
Long Island and in Little Hell G ate and for bro
file from the entrance to New York harbor. A
thorough comparative examination of specimen. of
the bottom In this section is in progress
Drawings for the of shore map from Point Judith
to Cape Henlopen; for the map OF the south shore
OF Long Island Sound, and for the large mao Of
Hell Gate, have been comp eted-the last nearly so
Engravings OF charts, sketches, harbors anchor
ages, &c in the same localities are under way. or
finished.
The business relations OF Mobile were much i'm.
proved by the discovery, three years ago. Of chan.
mel into the bay, twenty one feet deep. The past
year has added the discovery OF four shoals Ia the
main ship channel over the Nantucket shoals the
determination OF the position of Cashes ledge on
the coast OF New England, the reconnaissance OF
Hateras Cove and Hatteras Inlet, two haroors of
refuge formed within few years, which if locally
Known to pilots yet not generally 70 navigators.
IL suggested that Little Hell g ate passage ~.
ing between Wards and Raniars Islands. con.
meeting Harlem River with the main eastern an.
proech to Great Hell Gate passage, could be made
useful in small vessels bound eastward or wsst-
ward, and mast relieve the main passaca-tbp,
preventing accidents when crowded. Il, won8
shorte the distance, and relieve vessels bound for
the Eastward, 20 and from Harlem, from the n.eas
sty OF enconntering the dangers OF HelLGate-
Two or three rocks are to be removed. TbeIargast
one, called the Hogs Back Is 10 Is fee. lIng
and perhaps or feet in width az the base lies d.
rectly across the channel; but could bs easiIv 20.
moved by blasting. The second is near IL and
could be destroyed in a similar wa On tba third
fiat rock OF considerable size, between "S,nEso
Meadow and Wards Island, partly exoosa1 az
low water, beacon is recommended 10 be nlscsA
which would cost mere trihe. These rocks "a.
moved, passage would be opened Of Is To II fee,
OF water 81 low tide; and the current nov of 3 ~
81 miles an hour, would be diminished. The svsr,
age rise and fall Of tides is feet.