31

C—la

APPENDIX V.

TIDAL SURVEY. |By C. E. Adams, M.Sc, F.R.A.S.] Harmonic Analysis. The harmonic tidal constants for the ports of Wellington and Auckland have been obtained by harmonic analysis from the hourly ordinates measured from the self-registering tide-gauges. In each case the period of observation was one year ; Wellington for the year 1909, and Auckland for the year beginning 1908, December, 1.

Harmonic Tidal Constants.

Values of H are in English feet, k in degrees. Prediction. From the harmonic tidal constants the tides for Wellington and Auckland have been predicted, using the method described in the Tidal Survey Beports for 1910-11 and 1911-12. The tide-tables for these two ports for the year 1914 are given here. They are supplied to the British Admiralty and published in the Admiralty Tide-tables, and to the Marine Department and published in the New Zealand Nautical Almanac and Tide-tables. The time used in the tide-tables is New Zealand civil mean time for the meridian 11 h. 30 m. east of Greenwich ; 0 h is midnight, 12 h is noon ; all hours less than 12 are in the forenoon (a.m.), all greater are in the afternoon (p.m.), and when diminished by 12 give the times after noon —for instance, 14 h. 11 m. is 2 h. 11 m. p.m. Wellington Tide-tables for 1914. The heights, in feet and tenths, are measured from a point 36-131 ft. above the city datum, and approximately 1-8 ft. below mean sea-level.

Wellington. Auckland. Wellington. j Auckland. Latitude Longitude 41° 17' S. 174° 46' E. 37-931 ft. 0005 151-36 0112 332-98 0005 181-34 0005 298-67 0007 30-85 1-594 133-65 0022 184-01 0030 275-89 0013 76-55 0110 33-66 0 078 77-59 0042 312-25 0023 5304 0-007 143-21 36° 50' S. 174° 49' E. 9-237 ft. 0006 50-35 0-583 264-36 0-018 340-80. 0002 27-47 0-011 143 63 3-814 203-73 0052 202-32 0113 126-80 0-026 282-96 0059 148-79 0233 168.93 0-145 255-18 0068 166-21 0017 196-39 s. If Mf * If Mf M, 1 H "■■ (« Mf-■".-if m. if o|f Mf Mf Mf Mf Mf Mf NJ H (H V J 0-036 ft. 26-35 0-093 141-99 0-431 95-47 0125 107-37 0-082 81-28 0-024 169-69 0056 317-20 0039 137-58 0039 1973 0116 260-23 0048 172-03 0-161 60-87 0049 201-65 0073 165-59 0008 ft. 56-64 0-221 209-57 0-797 173-55 0-236 152-81 0-126 178-00 0024 237-40 0058 102-91 0169 194-56 0064 304-96 0-127 291-98 0072 204-75 0075 122-80 0091 62-55 0-028 56-77 J H < Mf MS (f 2SM Mm \f Mf j H MSf | H "I? Ssa j y