CO129-366 - Governor Sir Lugard Acting Governor May - 1910 [4-5] — Page 142

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be expected.

The Indian Survey meridian was accepted temporarily and, when the triangulation was carried through from a base at Tai Po which had already been co-ordinated, its bearing was found to disagree by only 3*. It has therefore been decided to accept the original meridian.

In the new triangulation, as already mentioned, a base was laid out at Tai Po measuring 2,168.786 feet and this was extended by a series of well-conditioned triangles, 15 in number, to Ngau Shi wan where another base 2,271.525 feet in length had been measured. The misclose was .175 foot representing an error of 1/12,980. Both bases are about 15 feet above sea

level and were measured with a 100-foot Kronstad wire. A11 the angles were observed with a Troughton & Simms 5* theodolite fitted with micrometer eye pieces reading to 10" and estimating to 1*, and each angle was read 6 times on each vernier, making a total of 12 readings. The largest error in any triangle is 13" and this occurs in one only. The largest error in any of the other triangles hitherto observed is 9*. Any triangle with an error in excess of this will not be accepted and the 13′′ error has yet to be corrected. 52 stations have been fixed and 33 of these have been valued; most of the others have been observed to and in some cases some observations have been taken

from them. All observations have been taken on to flashes by a mirror in sunlight: no night work has been attempted.

The work would have been much more forward but for the heavy cloudy weather in May and June and the rains during the whole of the Summer.

The area covered by the triangulation already completed is about 15 miles North and South by 44 miles East and West (vide diagram).