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No. 55. Report to the assistant in charge of the Coast Survey office, on the electrotyping operations of the Coast Survey, by George Mathiot, electrotypist.

No. 56. Report of Lieutenant Commanding W. A. Bartlett, United States navy, assistant in the coast survey, to the Superintendent, of the examinations of the reefs in Hell Gate channel, and changes produced by blasting.

No. 57. Report of the Superintendent of the Coast Survey to the Secretary of the Treasury, upon an examination in reference to a lighthouse at Humboldt harbor, California, made by Lieutenant Commanding James Alden, United States navy, assistant in the coast survey.

No. 57, bis. Letter of the Superintendent of the Coast Survey to the Hon. Joseph Grinnell, of the Committee on Commerce, House of Representatives, communicating a report of Lieutenant W. A. Bartlett, United States navy, assistant in the coast survey, on the importance of a light-house at Humboldt harbor.

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LIST OF SKETCHES ACCOMPANYING THIS REPORT.

Sketch of progress, Section 1.

Nantucket shoals, re-engraved.
Current Chart Boston harbor.

Sketch of Holmes' Hole, showing proposed beacon.

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Sketch of progress, Section, 3.

C, No. 2. Entrance Chesapeake.

C, No. 3. Fishing Battery.

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Gulf Stream soundings.

D, No. 5. Beaufort harbor.

Point Judith to N. York.
New York to Capes of

D, No. 6. Progress of survey of Cape Fear river and vicinity.
D, No. 7. Fryingpan shoals.

E.

E, No. 2.

E, No. 3.

E, No. 4.

Sketch of progress, Section 5.

Sketch of progress, Savannah river.

Sketch of progress, north and south Edisto and St. Helena
sound.

Savannah city.

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J.

Sketch of progress, Sections 10 and 11.

J. No. 2. Mare Island straits.

J, No. 3. Point Conception.

J, No. 4. Point Pinos.

J, No.

5. Trinidad bay.

J, No. 6. Entrance San Francisco.

J. No. 7. San Diego.

J, No. 8. Humboldt bay.

J. No. 9. Sketch of progress San Francisco.

J, No. 10. Sketch of progress San Diego.

J, No. 11. Point Pinos view, incorporated into McArthur's chart.

J, No. 12, 13, 14. McArthur's chart, 4th edition.

K.

Mouth of the Columbia river, showing site of light-house,

scale 200000.

K, No. 2. Cape Hancock.

K, No. 3. Mouth of the Columbia river, scale o

X. Plate showing the electrotype apparatus.

APPENDIX No. 1.

Distribution of the parties of the Coast Survey upon the coast of the United States, during the surveying seasons, in the different parts of the coast, from November, 1850, to November, 1851.

No. of sections

of survey.

Limits included in several
sections.

No. of parties

in section.

Operations.

Persons conducting the operations.

Localities of the several operations.

I Passamaquoddy bay to Point
Judith, including the coast
of Maine, New Hampshire,
Massachusetts, and Rhode
Island.

1 Primary triangulation and astronomical and magnetic observations.

2

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Magnetic observations
Reconnaissance

A. D. Bache, superintendent; Lieut.
W. P. Trowbridge, corps of en-
gineers, and assistant; Geo. W.
Dean, sub-assistant.

J. E. Hilgard, assistant

C. O. Boutelle, assistant; Brevet
Major Henry Prince, United
States army

4 Secondary triangulation - Captain T. J. Cram, United States
topographical engineers, assist-

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Mount Pleasant, Maine, occupied for geodetic and
astronomical observations; Ossipee Mt., Maine,
for geodetic, and Cape Small Point, Maine, for
astronomical observations. (See also Section
III.)

Saco, Kennebunk, and Portland harbors.
Extension of primary stations beyond Penobscot.
(Part of season; see also Section V.)

Sub-section from Portsmouth, New Hampshire, to
Saco, Maine, completed and connected with
primary triangulation.

Reconnaissance for secondary triangulation, Casco
bay, Maine, part of season.

Newburyport harbor, Massachusetts.

South and east shores of Cape Ann, Massachusetts,
from Beverly Farms to Halibut Point. (See also
Section IV.)

Chatham and vicinity, and Wellfleet, Cape Cod,
Massachusetts. (See also Section III.)
Nantucket shoals; Bass Rip; Davis' Bank; Fish-
ing Rip; Muskeget channel, off Bond island; and
Gay Head, Salem harbor, and its approaches.

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Hudson river, from limits of former work. (Part of season; see also Section III.)

Re-survey of Sandy Hook to determine its changes. (Part of season.)

Survey for ranges for Flynn's Knoll and Swash
channel. (Part of season.)

Verification on south side Long Island, from Nea-
peague to Montauk, and eastward. Revision of
entrance to Connecticut river. (See also Sec-
tion I.)

Off-shore work and tides and currents, between
Gay Head and Cape May.

Minute survey of Way's reef, Pot Rock, &c., at
Hell Gate, for changes by blasting.

Observations of latitude and azimuth at Causten's station, near Georgetown, D. C. (Part of season; see also Section I.)

Continuation of triangulation of Chesapeake, and
preliminary determination to capes. (See also
Section II.)

Longitude observations at Seaton station.
Outer shore of peninsula of eastern shore of Vir-
ginia, from Cedar island to Rogue's island.

To connect triangulation of Chesapeake and outer coast. (Part of season; see also Section IV.)

Point Judith to Cape Henlopen, including the coast of Connecticut, New York, New Jersey, Pennsylvania, and Delaware.

III Cape Henlopen to Cape Henry, including the coast

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of Delaware, Maryland,

and Virginia.

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