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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 bage wes laid out at Tai Po measuring 2,169.796 feet and this was extended by a series of well-conditioned triangles, 15 in number, to Ngau Shi Wan where another base 2,271.535 feet in length had
been measured. The misclose was .175 foot representing an error of 1/13,990. Both bases are about 15 feet above sea
€
level and were measured with a 100-foot Kronstad wirs. All the angles ware observed ith a Troughton & Sims 5 theodolite fitted with micrometer eye piecas reading to 10" and estimating to 1", and such angle was read 3 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 the:0. All observations have been taken 91 to flashes by & mirror in sunlight: no night work has been attempted.
The work would have been much more forward but for the heary cloudy weather in May and Juno and the rains during the whole of the Sumber.
The area covered by the triangulation already completed is about 15 miles North and South by 44 miles East and rest (vide diagran).
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