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6

The examination has emphasized very strongly the need, always felt, of a departmental bandbook covering all the grounds of the technical branches of the office, both draughting and computing and field. The book is now being planned, and several of the sections are being written by experienced officers in charge of the principal branches. The professional handbooks now in existence will be revised and incorporated in the plan. Surveyors' Board. At the examination in September, L920, twenty-six candidates sat, and twelve passed ; and at the March examination fifteen candidates sat, and six passed. At the end of the March examination the Board considered very fully the position regarding the issue of new Survev Regulations, and came to a conclusion regarding it. enabling the revision to be undertaken during the ensuing year. (b.) COMPUTATION OF TIDAL CONSTANTS BY E. -I. WILLIAMS, TIDE-COMPUTER. The computations required to evaluate the harmonic constants used in predicting the tides of the six standard ports for the year 1922 have been completed. From the harmonic analysis of the measured hourly heights of the tide gauge records of an) port extending over a. period of 370 days is obtained one value of II (semi-range) and one value of K (epoch) for each component for each year of hourly heights analysed. For the larger tides, M2, 82, &C, the values obtained are fairly concordant. In the smaller lid, s, however, on account of tidal observations not being exactly in accordance from year to year, there are considerable discrepancies. Therefore it is necessary to extend the observations over a number of years, and to accept the mean of the values of H and K for each tide, for the completed years of analysis, as the best result. In accordance with the above the following table was prepared and forwarded to the Director, National Physical Laboratory, Teddington, London, England, on the Ist June, 1920, for employment in the tide predicting machine, and the tide-tables for 11)22 wenreceived in Wellington on the Ith January, 1921.

Mean Values of the Harmonic Constants used in preparing the Tide-tables for 1922.

fide Symbol, i Auckland. A.~ r.-71 it. 01 A.lull'. 5.88 It. Dm A.-I neilin. I.ytl 3-2311. A. fcelton. Weill 8-20 ft. A 8 = lugton. 2-98 it. W oat port. V, :.-(iu ft. H. K. II. K. II II. , I K. II. K. II. K. II. - K. ... 68-10 18-50 233-57 Ft. 0-012 0-236 0-000 r~ short Period. SI 82 SI Ft. 0-009 11-03 0-597 203-50 0-019 336-59 Ft. 0-007 0-509 0-008 it. 337-10 0-035 129-95 0-173 301-85 o-ol I Ft. 31-12 0-005 141-42 0-098 188-72 0-005 228-48 329-46 188-20 Ft. 0-013 74-64 0-983 33 l-O!) onos 54.92 SO .Ml M2 0-002 50-9S 0-011 141-89 3-791 204-00 0-004 o-oi I 2-802 170-5(1 84-79 35-13 0-004 0-009 2-.-,06 123-00 0-014 128-68 , 0-010 123-38 2-883 348-69 0-005 105-35 , 0-006 125-30 1-597 309-32 49-45 135-35 0-003 334-63 0-013 340-63 3-702 304-20 ,M3 M4 MO 0-048 20402 0-110 127-80 0-023 294-55 0-008 0-095 0-086 281-81 228-49 77-28 0-013 0-257 0-076 245-03 0-019 179-05 0-014 359-86 0-021 108-63 0-026 81-25 0-037 66-42 0-010 192-86 280-40 100-77 0-024 202-01 0-066 35-28 0-020 88-59 <>J Kl K2 0-002 130-02 0-231 107-71 0-142 251-27 0-1 08 0-001 0-118 75-29 11310 57-84 0-087 0-071 0-096 75-72 0-087 89-15 0-144 127-52 0-054 02-78 0-105 SI -50 0-086 101-90 : 0-040 34-45 79-98 340-07 0-096 48-20 0-075 184-91 0-287 327-05 PI .11 Ql 0-073 167-06 0-010 214-22 0-011 59-11 0-021 0-001 0-024 103-64 207-39 43-55 0-025 0-005 0-021 96-80 0-052 126-14 0-008 355-00 ■ 0-018 110-79 0-030 89-85 o-ooo 48-24 0-029 07-31 140-90 22-22 0-023 110-12 0-015 27.".-1 5 0-037 38-40 L2 \2 ■ i.2 0-190 212-0 1 0-7SI 109-09 0-202 180-03 0-127 0-661 0-099 28-87 14-04 68-00 0-189 0-549 0-053 101-32 0-094 104-89 0-670 157-88 0-118 L08-35 0-055 93-58 0-389 : 145-96 0-108 140-71 99-67 109-38 01 lo 269-18 0-745 288-44 0173 310-14 /*8 T2 (MS)4 0-104 168-04 0-077 103-21 0-176 193-71 0-005 0-023 0-080 8-37 I 11-71 359-97 0-034 0-022 0-100 17-52 0-087 202-01 0-032 141-93 0-101 66-46 0-081 220-40 i o-oHi 128-62 0-036 86-45 308-20 134-61 01 II 273-67 0-042 44-18 o-loo 301-30 (2SM)2 R2 0-003 307-32 0-038 0-018 120-79 119-43 0-043 0-010 4-23 0-077 171-09 0-01 I 25-77 0-088 172-05 5-18 0-078 203-08 0-019 244-29 Lon\: Period. Mm MI MSf 0-123 211-03 0-055 268-88 0-075 153-37 0-059 0-009 0-077 IS 1-50 161-91 201-00 0-055 0-003 0-000 84-43 0-055 173-15 OOOO 31-88 0-150 IS5-59 0-087 187-05 O-IKi.i 159-87 0-098 308-38 158-15 13-79 0-016 117-13 0-033 303-53 0-060 99-27 Sa Ssa 0-230 54-00 0-107 293-07 0-073 0-120 26-81 88-39 0-105 0063 272-79 0-087 80-02 0-109 245-99 0-138 124-05 0-073 192-55 191-54 0-120 62-55 0-130 97-45 I i