CO885-(18-19) — Page 336

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35421

SIR,

194

No. 135A.

EAST AFRICA PROTECTORATE.

ADMIRALTY to COLONIAL OFFICE.

(Received 29 September, 1908.)

Hydrographic Department, Admiralty, London, S.W.,

26 September, 1908. In reply to your letter of the 23rd instant,* No. 33941/1908, I beg to forward herewith the original drawings referred to therein. The published Admiralty Charts being based upon these originals, I should be glad to be informed if there is any probability of their being returned at some future period.

I am, &c.,

A. MOSTYN FIELD,

Hydrographer.

195

be advisable for an officer to be sent out from the Topographical Section of the General Staff of the War Office to examine and report upon the survey work now being carried out in Southern Nigeria.

3. The work referred to in Mr. Cotton's letter as requisitioned by Professor Simpson is merely a survey of the watershed of the Iju River, which is of no great extent, and which should only occupy one of the officers of the Department for one or two months at the most.

6. I do not anticipate that the Survey Department will be required to carry out any work in connection with the proposed harbour works that cannot be done by the surveyor detailed for town surveys.

7. Mr. Cotton has been given more than the money he stated was necessary to carry out the surveys. He arranged, probably correctly, that a large portion of his staff should be on leave at the same time as himself, so that during his absence Mr. Cleminson was left with very little assistance.

8. My despatch, No. 145, of 7th March, 1908,* recommended a salary of £100-£20-£500 for the Senior Surveyor, and the Estimates for 1909, now about to be submitted to the Council, provide for this amount. appointment be filled at once.

I recommend that the

Enclosure in No. 135A.

HYDROGRAPHIC Department, ADMIRALTY.

List of original drawings of the Survey of the southern (German) portion of Lake Victoria Nyanza, by Commander B. Whitehouse, R.N., 1902-6.

C. 1938.

C. 1939/1-3.

C. 1940/1.

C. 1940/2-6.

C. 1941.

C. 1942.

C. 1943.

C. 1945.

C. 1946.

C. 1947/1-2.

C. 1948.

35356

Tracing and sun print of the whole area

Three triangulation sheets of the whole area.

Plotting sheet (plan and tracing).

Five plotting sheets.

Tracing of soundings.

Tracing of soundings.

Plan and tracing of Namaungu Bay.

Plan of Bukoba Roadstead.

Plan of Shirati Bay (sun print).

Plan of Shirati Bay (in two sheets).

Plan and sun print of Lubembe Harbour.

No. 136.

SOUTHERN NIGERIA.

THE GOVERNOR to THE SECRETARY OF STATE.

(Confidential.)

MY LORD,

(Received September 28, 1908.) [Answered by No. 149.]

Government House, Lagos, Southern Nigeria,

7 September, 1908.

In reply to your Lordship's telegram of the 21st of August,† I have the honour to enclose copy of a letter, dated the 1st instant, received from the Director of Surveys, and to confirm my telegram of the 4th idem.‡

2. I would call attention to the large amount of survey work which is carried out in Southern Nigeria by astronomical observation and by readings of barometers and aneroids, and to express my preference to such work being carried out by trigonometrical observations and by theodolite and plane-table surveying. I also suggest that contours shown by lines convey more clearly the nature of the country mapped than a plan with numerous figures scattered over it.

3. Except in June and September rain should not materially affect surveying work in the Western Province, and even in those months the interruptions caused by rain are partly counterbalanced by the much greater clearness of the air.

4. I would suggest, for your Lordship's consideration, whether it would not

Not rated.

† No. 126.

32435: not printed.

Enclosure in No. 136.

(No. 142/1908. Confidential.)

SIR,

i have, &c.,

W. EGERTON,

Governor.

Survey Department, Lagos, 1 September, 1908. In reply to your letter, No. C.S.O. 295/1908, which was forwarded to me when on tour in the hinterland, I beg to inform you that a complete survey of Sheet 73 J, amounting to about 3,630 square miles, or about one-half the area stipulated in paragraph 3 of letter No. 5066/1908, addressed to me by the Colonial Office under date the 18th of March, 1908, has now been completed. It includes a 25-foot contour survey of the area represented on that sheet, to which has been added any details which may have been omitted in last year's work; topographical features, such as dense forest, oil palm areas, farm areas, swamps, limit of man- grove, &c., have been carefully surveyed and added in suitable colours.

The contours have been established by fixing stations at not more than 15 miles apart, by levelling, and by the simultaneous readings of barometers whose index errors had been previously and frequently compared. These barometric levels have been frequently checked against accurate levelling, and it has been found that they agree so closely that further instrumental levelling is considered unneces- sary. The actual heights obtained from these accurate skeleton levels above mean sea-level are to be recorded on the plan in figures.

3. The closes have been checked against the railway levels, or compared with the level of the sea or lagoon.

4.

In Sheet 73 J about 430 miles of accurate skeleton levels have been estab. lished and about 110 miles of filling in by aneroids have been completed. The aneroid work has been connected to the skeleton stations and has been properly reduced and adjusted under my personal supervision.

5. Plan of Sheet No. 73 J should be completed and forwarded in not less than a month hence; it would have been finished earlier but for the wet season, which commenced about a fortnight after my arrival and has continued ever since, and will probably continue for another month. This, of course, has seriously interfereJ with the work, and has frequently prevented that continuity which is very desirable in this class of work.

6. The hills in Sheet 73 J are almost a negligible quantity. They are defined by plane-table survey, by heights at base and summit, and by fairly careful defini- tion of the spurs and gullies. The method of photo-surveying has also been frc- quently applied to the larger hills in Sheets Nos. 73 D and 73 E.

7. About 550 miles of barometric skeleton work has been completed in Sheets 73 D and 73 E, and a large amount of photo-surveying has also been accom-

* 11304: not printed.

29131

2 B 2

PUBLIC RECORD OFFICE

Reference :-

C.O.885

18 PUBLIC RECORD OFFICE, LONDON

ALLY WITHOUT PERMISSION OF THE BE REPRODUCED PHOTOGRAPHIC-

COPYRIGHT PHOTOGRAPH-NOT TO