C—la

28

Table 4 .

In the case of a large number of readings being taken, it is sufficient, as a rule, to correct the mean reading from Table lor Table 3 only. It is only necessary to correct the individual readings from Table 2 or Table 4 when the highest accuracy is required. September 25th, 1912. . (Signed) R. T. Glazebrook, Director. Bef. M. 105, 62. Mr. John Langmuir, Inspector of Surveys, reports that under the heading of secondary triangulation his work for the year has been only of a preparatory nature —viz., in the visiting of positions in the proposed scheme of triangulation, and with the erection of large permanent signals at twenty-one of the stations. In this connection the following islands lying off the east coast of the Auckland. District were visited —viz., one of the Mokohinau Group, Great Barrier, Cuvier, Great Mercury, Bed Mercury, and Flat Island of the Aldermen Group. Signals have since been erected on these islands. At the Great Barrier Island it was discovered that many of the old minor trig, stations were much in need of attention, while in some cases the tubes were entirely missing. A contract has been let to effect the necessary repairs. Apart from this, the country some 96 miles north of Auckland has been travelled over, and proposed stations visited to ensure that they are reciprocally visible from one another. The area covered by this triangulation —of which so far the positions of stations have been examined and part of the signals built —will be nearly three million acres of land and water. The work of laying down suitable base-lines—reference to which has been made in previous yearly reports —has been continued on the last base chosen, viz., that on the Kaingaroa Plains. Up to the 31st March the total chainage completed at this base was 11-94 miles, of which 2-74 miles was done last year. To ensure accuracy as far as possible this mileage was gone over four times, which means that a total distance of 47-76 miles was chained. It is desirable that another base be measured in North Auckland if a suitable one can be obtained. The most likely country will, I think, he about the Kerikeri, Bay of Islands, or Waimate North. This base should be the last required in the North Island.

APPENDIX IV. y REPORT ON EXPLORATION TRIP, DIRECT ROUTE, LAKE WAKATIPU TO MILFORD SOUND. [By D. Macphekson, District Surveyor.] The plan accompanying this report is not intended for an accurate presentment of the route, such as could be obtained from a prismatic and chain traverse, but is simply a sketch, from prismatic bearings of main direction of the valleys, &c. As there is a well-known pack-track from Elfin Bay, on Lake Wakatipu, up the Greenstone River to Lake Howdcn, at its source, a distance of about twenty-five miles, I will confine my report to the country to the west of this. Leaving Lake Howden on the morning of the 28th December, 1912, accompanied by Guide Lippe, of the Hermitage staff, Mount Cook, and under the able guidance of Messrs. Grave and Talbot, we set out with a 47 lb. swag and an ice-axe each. Rain had just commenced as we started, which made the bush wet, and obscured the view of surrounding mountains. Leaving the Hollyford track after less than half a mile, we struck westward and downwards towards the Hollyford River; the going was fairly good, and the fall about 1,000 ft. The river is here a chain and a half or more in width, with a rapid flow of from 2 ft. to 4 ft. of water, its course being fairly direct. We kept up the southern side of the Hollyford River right up to Monkey Creek. The route lay through flat bush at first, till after the outlet from Lake Marion is passed, when a high bluff obstructs the passage; this can be negotiated close to the river, then a succession of rather steep sidelings is met, and we were glad to avail ourselves of the first strip of flat ground to pitch camp.

( Cor Corrections to Readings from Reading on Drum on Link Scale. I — i i 0 to-01. ■01 to -02. •02 to -03. •03 to -04. •04 to -05. 0 20 40 60 80 100 120 140 160 180 200 220 240 250 Division 1 . " I Links. •OOOOOo + -00000 3 + -00000 4 + -00000 3 - -00000. - -00000 c, - -00001 „ - -00002 2 - -00002 4 - -00002 2 - -00001 e - -00001,, - -ooooo., •OOOOOo Links. ■OOOOOo + -00000., + -ooooo 2 ■OOOOOo - ooooo, - -00001., - -00001 a - -00002, - -00002, - -00002, - -00001, - -ooooo, - -ooooo 2 •OOOOOo Links. •OOOOOo + -ooooo, + -00000 , - ooooo, - -00000 8 - -00001 „ - -00002, - -00002,. - -00002 5 - -00002 , - -00001 B - -ooooo, - -ooooo, •OOOOOo I I Links. •OOOOOo + -ooooo, •00000 0 - -ooooo, - -00001. - -00001 8 - -00002 ft, - -00002, - -00002, - -00002 o - -00001, - -ooooo (; - -00000! •OOOOOo I I Links. •00000,, •00000„ - -ooooo, - -ooooo „ - -00001., - -00002 o - -00002 „ - -00002- - -00002, - -00001, - -00001, - -ooooo, - -ooooo, •ooooo o