2734
THE NEW ZEALAND GAZETTE.
[No. 77

and when resorted to, whether as the basis of town, suburban, or rural surveys, the stations must be permanently marked and accurately centred. “Standard blocks” of stone or concrete are to be laid down in towns, and iron tubes elsewhere; all placed in positions least liable to disturbance in the carrying-out of subsequent public or private works. The stations must be selected so that the standard lines shall, if practicable, be parallel to the side lines of the streets or roadways.

Angular observations.

25. The angular measures will comprise observations effected as in minor triangulation, modified where necessary according to the importance and special circumstances affecting the area under survey.

Lineal measurement and limit of error.

26. In lineal measurements, corrections for tension, sag, temperature, inclination, &c., must be carefully applied, and the maximum error must not exceed 1 link per mile, according to the degree of accuracy prescribed by the Chief Surveyor in each case.

Connection with triangulation.

27. The standard traverse must be connected with the triangulation (if any) and any discrepancy reported. In cases where a district presents difficulties preventing minor triangulation or approved traverse circuit, the matter must be reported to the Chief Surveyor, who will issue special instructions to meet the case.

Method to be pursued.

28. The whole work must be computed on a system of circuit-closures, increased weight being given to the measurements as compared with angular observations; correction must be applied in the recognised manner to furnish the true co-ordinated values. The survey includes the connecting with all adjacent surveys, and the fixing of boundaries and corners of properties as indicated by pegs, fences, hedges, walls, buildings, and other artificial and natural features. The results, being carefully delineated upon plans, on scales ranging from 1 to 10 chains to the inch, according to the class of survey, serve as records of title, boundaries, and occupation, and as the basis of present and future surveys, especially those for purposes of “The Land Transfer Act, 1885.” (See Appendix 9.)

SETTLEMENT SURVEYS.

Survey districts and blocks.

29. A survey district as a rule comprises an area of 12½ miles square or thereabouts and a block comprises an area of 3¼ miles square. In numbering the blocks within a full-sized survey district, the numbers are to commence at the north-west corner and be numbered towards the right from I to IV; No. V will come immediately to the south of No. I, and so on throughout the district.

Irregular districts.

30. When a district has an irregular boundary the same order of numbering must be followed so far as the area will allow, care being taken to use the numbers consecutively. The lines dividing districts and blocks should be straight, unless where road-lines, rivers, or section-boundaries approximate the right line, in which case they should be adopted. No survey block should exceed in length or breadth the distance of 250 chains unless under special circumstances.

Sections to be adapted to country.

31. Flat or easy undulating country should be laid off in rectangular sections, but in rugged or hilly country their form must be modified to suit the ridges and valleys, and also, in the case of rolling arable land, care must be taken to arrange boundaries favourable to ploughing operations. Where the country is suitable it is desirable to have the boundaries on the meridian and perpendicular, but when the general features run obliquely to these, especially in rough districts, the boundaries must be arranged accordingly, so as to form lines which can be easily