JUNE 4.

THE NEW ZEALAND GAZETTE.

1853

completion of the land-plan survey, to restore the original centre-line pegs
of the railway survey, including the tangent and intersection or tie-line
pegs. Where necessary the curves are to be computed in the same manner
as for the engineering survey. If iron tubes have not been put in during the
engineering survey, or if they have been made inaccessible during con-
struction, the surveyor shall put in iron tubes of standard pattern at
intersection pegs at half mile intervals. Where the land-plan survey is
carried out before construction is commenced, and iron tubes have not been
put in during the engineering survey, the surveyor should not put in tubes
where they are likely to be made inaccessible during construction. If
necessary, instead of a tube at the intersection peg, two tubes should be put
in as extension pegs or tie-line pegs.

3. Lands to be taken are to be coloured in different shades or colours
   for each adjoining property.

4. Where land is taken from two or more sections or subdivisions belonging
   to one owner, the area taken from each section or subdivision must be stated
   and each section coloured distinctively.

5. The name of the survey district and the number of the block in such
   survey district must be given on each sheet, and the block or survey district
   boundary must be indicated by the respective conventional dotted lines
   adopted for that purpose by the Lands and Survey Department, and
   marked “Block” or “Survey district boundary,” as the case may be.
   The name of the local body in whose district the land lies is also to be stated,
   and the boundaries of such districts are to be shown if coming within the
   plan.

6. When Crown land is taken for a railway or a ballast-pit, &c., such
   land should be described as “Crown land” and not “Railway reserve,”
   “Ballast reserve,” &c., unless it has been actually reserved for such purpose
   by Gazette notice.

7. All existing roads that are to be left open for the use of the public,
   whether crossed by railway or not, must be coloured burnt sienna.

8. If any part of a road crossed by a railway is to be closed to the use
   of the public and occupied exclusively by the railway, the portion to be
   closed must be coloured green and the area must be stated.

9. Land required to be taken for new roads, such as approach roads to
   railway-stations or road-deviations rendered necessary by existing roads
   being closed by railway-works, are to be coloured sepia or orange, or if portions
   of such new road or deviation are taken from adjoining sections then such
   area so taken from each section shall be coloured alternately sepia or orange.

10. The use of burnt sienna, sepia, orange, and green must be restricted
    to the cases mentioned above.

11. No private crossing on railways to be distinctively coloured or
    shown in any way.

12. Plans to be in duplicate, one copy to be prepared on mounted
    drawing-paper, and one copy to be on mounted tracing-cloth.

13. The regulations of the Lands and Survey Department to be observed
    except where herein varied.

14. Land plans, or portions thereof, with all necessary explanatory
    data when completed, should be forwarded to the Head Office, through the
    local office of the Department, before being submitted to the Chief Surveyor
    for approval. On receipt of the plans, or any portion of same at this office,
    a progress payment of 50 per cent. of the value of the work done will be
    made; and after the whole of the plans have been approved by the Depart-
    ment and the Chief Surveyor, the final payment will be made.

APPENDIX R.

DETERMINATION OF MEAN HIGH-WATER MARK AND MEAN SEA-LEVEL.

Land abutting on tidal waters is bounded by the line of ordinary high-
water mark, or, more precisely, the line of mean high water taken over a
period of 370 days. On the open seashore mean high-water mark is a
contour-line which can be easily determined by a series of tidal observations
extending over the above-mentioned period. In the case of tidal estuaries
and rivers mean high-water mark usually departs from a level line, and
usually requires for its exact determination that similar tidal observations
at the extremities and at suitably placed intermediate stations of the
boundary to be fixed are available.

Mean sea-level is now used exclusively as the datum for all surveys on
land by the Lands and Survey Department. It may be established within
a small fraction of a foot by continuous tidal observations for a period of
370 days, and is that surface which the water of the ocean would form if
it were not disturbed by the attraction of the sun and moon and the force
of the wind. Information regarding the bench-marks connected with the
automatic tide-gauges from which the mean sea-level was determined at