of Boston harbor, scale 7000, which is now finished. He has also executed a part of the topography of Charleston harbor; made additions to the map of Long Island sound, and several excellent tracings.

Mr. Mahon was occupied upon the reduction of the topography of Mobile bay No. II, which he finished in June. Since then he has been at work upon the reduction of the topography of Salem harbor.

Mr. Luce has finished the topography of Albemarle sound, scale

, and has executed the principal part of the hydrography. He has also made various right-line drawings, tracings, projections, and sketches for the annual report.

Mr. Ricketts has been engaged upon the hydrography of Mobile bay Nos. I and II, (No. II being finished,) hydrography of Key West, scale 30000, and has finished the hydrography of the harbors of Huntingdon, Black Rock, Captain's island, East and West, Hart and City islands, Cawkin's island, and Sheffield island; has reduced the hydrography of the vicinity of the city of Savannah, and made an entirely new reduction of Nantucket shoals, and much other miscellaneous hydrography.

Mr. Boschke has completed the topography of Key West, scale 50000, mouth of Columbia river, scale 40000 and 20000, and has made many projects, projections for plane-table and hydrographic parties, projections on copper, tracings, and annual report sketches.

Mr. Tennent was transferred to the engraving department in January, and previous to that time had been at work upon register maps, projections, &c.

Mr. Lambert has finished the topography of Wellfleet harbor, Hart and City islands, and Richmond island; and has been at work on the topography of Chesapeake bay No. I, and other miscellaneous matter. He has also executed some beautiful specimens of topography for use of the office. He has finished the New York current chart, and Charleston harbor chart, scale Too. He left the survey on the 30th September.

Mr. Fornaro has executed the topography of Galveston city and harbor, and has been engaged upon the topography of Beaufort harbor, tracings, projections, and annual report sketches. He has suffered much from sickness for the last three months.

This estimable gentleman died on the 4th November, after a lingering illness of three months. He was a major of topographical engineers in the Swiss service; suffered much from ill health since his arrival in this country, and departed with the esteem and regrets of all who knew him.

Mr. Forsyth joined the office in December, 1850, and was occupied upon register maps, history maps, and tracings, until May, 1851, when he left the office.

Mr. Walker joined the office in December, 1850, and was occupied upon register maps and projects until May, when he joined a planetable party in the field. He was again attached to the office in No

vember.

Mr. Townsend joined the office in August, and has rendered valuable assistance in making the progress maps. On the 15th October he was compelled to resign from ill health.

Mr. Hergesheimer joined the office on the 1st September, 1851, and has already proved a valuable addition to the department.

Mr. Hebst has executed several pieces of work on contract, and in a highly creditable manner.

Mr. Meyer, Mr. Neidlescioky, Mr. De Ahna, and Mr. Gritzner, have severally been employed for a few weeks in execution of various tracings and reductions upon contract

3. ENGRAVING. This department was under the charge of assistant W. M. C. Fairfax till the close of January, when, at his own request, he was transferred to the drawing department. From that time till October it was under my direction, J. C. Tennent, esq., assisting me in matters of detail, since which time it has been under the charge of Lieutenant E. B. Hunt, corps of engineers and assistant in coast survey. A.-The engraving of the following finished maps has been completed: 1. South side of Long Island, No. 1, by J. Knight, H. Knight, and O. A. Lawson; 2. Hart and City islands and Sachem's Head, by F. Dankworth, W. Smith, H. Knight, R. T. Knight, and J. V. N. Throop; 3. Hell Gate, by G. McCoy, F. Dankworth, and J. Knight; 4. Mobile entrance, (original and electrotype,) by R. T. Knight, J. Knight, F. Dankworth, and W. Smith; 5. Richmond's Island harbor, (being the preliminary sketch filled in with topography,) by Wm. Smith, F. Dankworth, J. V. N. Throop, G. McCoy, and S. Siebert.

B. The engraving of the following sketches and preliminary charts has been completed: 1-3. Reconnaissance chart, (McArthur,) western coast, by S. Siebert, J. V. N. Throop, W. Smith, J. Knight, R. T. Knight, O. A. Lawson, E. F. Woodward, G. McCoy, A. Rolle, and F. Dankworth; 4. Richmond's Island harbor, by Wm. Smith and J. V. N. Throop; 5. Nantucket shoals, by J. V. N. Throop, O. A. Lawson, J. Knight, and R. T. Knight; 6-8. Second edition (McArthur) western coast, by G. McCoy; 9. Hatteras inlet, (resurvey,) by W. Smith, R. T. Knight, and J. V. N. Throop; 10-14. Five diagram maps of Cat island tides, by J. V. N. Throop, R. T. Knight, T. D. Donohoo, H. Knight, and T. H. Oehlschlager; 15. Reconnaissance of Mosquito inlet, by G. McCoy, W. Smith, and T. D. Donohoo, (per contract); 16. Reconnaissance of Horn Island pass, by H. Knight, R. T. Knight, and T. D. Donohoo; 17. Point Conception, by H. Knight, W. Smith, J. V. N. Throop, and T. H. Oehlschlager; 18. Point Pinos and Bay of Monterey, by H. Knight, R. T. Knight, J. V. N. Throop, and H. C. Evens; 19. Mare Island straits, by W. Smith, J. V. N. Throop, G. McCoy, W. H. Dougal, H. Knight, R. T. Knight, and T. D. Donohoo; 20. Current chart of Boston harbor, by H. Knight and R. Knight; 21. Reconnaissance of Cedar keys, by J. V. N. Throop, R. T. Knight, and H. Knight; 22. Reconnaissance of the Delta of the Mississippi, by W. Smith, E. F. Woodward, G. McCoy, and J. V. N. Throop, (per contract;) 23. Reconnaissance of Pass Christian, by H. Knight, J. V. N. Throop, W. Smith, T. D. Donohoo, and H. C. Evens; 24. Galveston bay, by H. Knight, J. V. N. Throop, R. T. Knight, and T. D. Donohoo; 25. Áransas Pass, by J. V. N. Throop, R. T. Knight, and T. H. Oehlschlager; 26. Trinidad bay, by G. McCoy, W. H. Dougal, and J. V. N. Throop; 27. Entrance of Columbia river, by E. F. Woodward; 28. Cape Hancock, by G. McCoy and Wm. Smith; 29. Holmes' Hole, by J. Acker

man; 30-36. Seven maps of progress and geographical positions for annnal report.

C.-The engraving of the following finished maps has been continued: 1. General coast chart, by F. Dankworth, O. A. Lawson, G. McCoy, and J. Knight; 2. No. 1, Long Island sound, by J. Knight, A. Rolle, O. A. Lawson, G. McCoy, and S. Siebert; 3. No. 1, Chesapeake bay, by O. A. Lawson and F. Dankworth; 4. Patapsco river, by O. A. Lawson and F. Dankworth; 5. No. 2, south side of Long Island, by O. A. Lawson and J. Knight; 6. No. 1, eastern series, by S. Siebert, J. V. N. Throop, and J. Knight; 7. Boston harbor, by A. Rolle, G. McCoy, H. M. Knight, and J. Knight; 8. Muskeget channel, by F. Dankworth, and E. F. Woodward.

D. The engraving of the following finished maps has been commenced: 9. Charleston harbor, by E. F. Woodward, F. Dankworth, S. T. Pettit, and G. McCoy; 10. Key West, by E. F. Woodward, W. Smith, F. Dankworth, and H. M. Knight; 11. Connecticut river, by S. Siebert, G. McCoy, W. Smith, W. H. Dougal, and T. D. Donohoo; 12, 13. Nos. 1 and 2, Mobile bay, by F. Dankworth.

E. The engraving of the following sketches and preliminary charts has been commenced: 1. Seacoast of Delaware and Maryland, (plate enlarged by electrotyping additional engraving work of hydrographic parties,) by W. Smith and J. Knight; 2. Beaufort harbor, by S. Siebert, J. V. N. Throop, H. M. Knight and R. T. Knight; 3. Humboldt bay, by W. Smith, T. D. Donohoo, and H. C. Evans; 4. Harbor of Key West, by A. Rolle, W. Smith, E. F. Woodward, R. T. Knight, H. M. Knight, and T. D. Donohoo; 5. Entrance of the Chesapeake, by S. Stull; 6. Re-engraving of Nantucket shoals, by J. H. Goldthwait; 7. Harbor of San Diego, by E. Yeager and T. D. Donohoo; 8. Entrance of San Francisco, by S. Siebert, E. F. Woodward, and J. V. N. Throop; 9. Savannah river, vicinity of Savannah, by J. V. N. Throop, H. M. Knight, T. H. Oehlschlager, T. Donohoo, and H. C. Evans; 10. Savannah entrance, by J. V. N. Throop and E. Yeager; 11. Mobile bay, by H. M. Knight, R. T. Knight, J. V. N. Throop, and H. C. Evans; 12. Bull's bay, (re-engraving,) by J. V. N. Throop, and T. Donohoo; 13. Entrance of Columbia river, by E. F. Woodward, W. Smith, J. V. N. Throop, and G. McCoy; 14-16. New edition of McArthur's chart of the western coast, by G. McCoy and W. Smith; 17. Point Pinos, (view,) by S. V. Hunt; 18. View of the mouth of the Columbia river, by G. McCoy; 19-26. Eight maps of progress and geographical positions.

ELECTROTYPING.-Mr. Mathiot has made, by the electrotyping process, during the past year, 16 engraved plates, all of which have been used by the printer. 1. Edgartown harbor; 2. New London; 3. New York (second electrotype copy ;) 4, 5, 6. Sheets Nos. 1, 2, 3, McArthur's chart of the western coast; 7. Sheet No. 2, McArthur's chart of the western coast (second electrotype copy;) 8. No. 2, south side Long Island, (second electrotype copy;) 9. Mouth of the Columbia river; 10. Seacoast of Delaware and Maryland, (greatly enlarged;) 11, 12. Two copies of Hart and City islands, and Sachem's Head; 13. Sketch of Section IX; 14. Mobile entrance; 15, 16. Third and fourth electrotype copies of New York.

Mr. Mathiot has likewise furnished the engraving department 57 blank plates for engraving; inspected all the copper-plates purchased during the year; made eighteen metre scales by the electrotyping process; applied forty-two days' work, of ten hours each, to repairing magnetic and electric apparatus for the party employed in determining longitudes by the magnetic telegraph, and in partly making metallic thermometers for deep-sea temperatures. These thermometers are about two-thirds done, and have been suspended for want of material to complete them. Two weeks have been occupied in removing the electrotype apparatus to the building now occupied by it, and about twenty days in repairing derangements occasioned by the removal. Much time has also been occupied in renovations, changes, and the introduction of improved processes, as has been previously adverted to.

PRINTING. Since the 1st of November, 1850, there have been printed from Delaware bay and river (electrotype plate No. 1) 2,202 sheets, (this map consists of three sheets;) from the western part of the southern coast of Long Island, (electrotype No. 2,) 1,274 copies; from the small map of the bay and harbor of New York, (electrotype No. 2,) 650; No. 3, 600; No. 4, 600 copies; from the large map of New York bay and harbor, (original plates,) 300 sheets, (this map consists of six sheets); from the harbors of Cat and Ship islands, (electrotype No. 1,) 520 copies; from the western coast reconnaissance, (original plates,) 1,842 sheets; (electrotype No. 1,) 4,728 sheets, (this map consists of three sheets); from Pasquotank river, (electrotype No. 1,) 333 copies; from Cawkins and Sheffield islands, (electrotype No. 1,) 290 copies; from Hyannis harbor, (electrotype No. 1,) 200 copies; from Hart and City islands and Sachem's Head harbor, (electrotype No. 2,) 1,207 copies; from preliminary sketch of Richmond's island, (original plate,) 100 copies; from harbor of New London, (electrotype No. 2) 250 copies; from Oyster or Syosset bay, (electrotype No. 1,) 500 copies; from Huntingdon bay, (electrotype No. 1,) 500 copies; making in all 16,096 sheets.

Besides these, there have been printed 891 copies from the annual sketch plates; 382 from Davis' New South shoal; 250 from the seacoast of Delaware and Maryland; 426 from Hatteras shoals; 230 from Hatteras inlet; 30 from St. Andrew's shoals; 50 from Beaufort harbor; 375 from Cape Canaveral shoals; 600 tidal diagrams; 11,062 Cat island tides; 2,899 proofs of finished and unfinished plates and annual sketches; 325 circular protractors and scales of shades. There have also been 255 sheets antiquarian and 10 sheets double-elephant paper stretched in the printing office since the 1st of January, 1851.

PUBLISHING. At the date of the last report 29 sheets of Coast Survey maps and 11 sketches had been published; these numbers have since been increased to 37 charts and 33 sketches.

Since November, 1850, there have been distributed, by direction of the Treasury Department, and for use in the survey, 1,104 sheets of Delaware bay and river, 554 copies of Hyannis barbor, 549 copies of Pasquotank river, 565 copies of harbors of Cat and Ship islands, and 1,704 sheets of the western coast. The whole number of sheets distributed is 4,476.

There have been turned over to the disbursing officer of the Coast

Survey, to be placed with agents for sale, 150 sheets of the large map of New York bay and harbor; 1,224 sheets of Delaware bay and river; 651 copies of small map of New York bay and harbor, 110 copies of New Bedford, 309 copies of Nantucket harbor, 162 copies of the harbors of Cawkins and Sheffield islands, 195 copies of Hyannis harbor, 234 copies of Pasquotank river, 348 copies of the harbors of Cat and Ship islands, 3,200 sheets of the western coast, 221 copies of the western part of the southern coast of Long Island, 587 copies of Hart and City islands and Sachem's Head habor,-being in all, 7,391 sheets of maps.

INSTRUMENT MAKING AND REPAIRS.-The alterations, repairs, dividing and cleaning, required by the instruments of the field and office parties, generally, have been made during the past year under the direction of Joseph Saxton, esq.

Besides, there have been made two trestles for base apparatus, two deep-sea buckets, a telegraph cylinder, a ruling machine, a plane-table, three tripod stands for telescopes, six iron plummets, thirteen metre chains; a ten-inch vertical circle has been altered into a theodolite, theodolites repaired, heliotropes repaired and adjusted, sextants and drawing instruments repaired.

ARCHIVES AND LIBRARY.-Mr. C. B. Snow, in charge of the archives and library, has re-registered the original and duplicate geodetic work, securing simple and convenient reference; separated the hydrographic and topographic reductions of original maps into their appropriate sections, and opened a new register, arranged chronologically, with an alphabetical index; superintended the binding of the original and duplicate sounding and angle books; nearly finished arranging the hydrographic and topographic sheets in single tubes; superintended the force employed in copying sounding and tidal observations required to correct errors and complete duplicates, which duty will soon be completed; examined the returns of the permanent tidal observers, and reported as to completeness; and placed the library in condition for convenient use.

MISCELLANEOUS.-The foregoing office-work has been generally under the immediate direction of the assistant in charge of the office. I proceed to notice other office duties conducted under my own immediate superintendence.

The examination of the hydrographic work returned by the different parties, the revision of sailing directions and lists of dangers, the comparison of charts prepared at different periods, the general direction of tidal computations according to prescribed form, and various miscellaneous hydrographic work, would occupy the time and attention of an accomplished hydrographer, with several assistants. During the past year, much aid has been derived from the labors, under my immediate direction, of Lieutenant Wm. B. Whiting, United States navy, who was detailed for coast survey service in March last; in examining portions of the work in various sections, and in revising other portions, and in reporting on subjects occurring during the progress of reduction of the charts. He has also computed the tidal observations at seven stations, and has directed the reductions made by Passed Midshipman