a—la

Mean Values of the Harmonic Constants used in preparing the Tide-tables for 1921.

Magnetic Survey and Observatory. The Magnetic Observatory was visited on the 16th March, and next day, accompanied by the Director, Mr. H. F. Skey, B.Sc, a visit was made to the substation at Amberley. The work of the Observatory has been performed in a satisfactory manner during the past year, and good progress has been made in overtaking arrears of work, so that the hourly values of the magnetic elements of declination and horizontal force for the year 1905, in addition to those for 1919, have been measured, and will be published in Appendix II of the annual report, which is bound separately and issued only to the institutions and scientists interested in this field of work. A suitable assistant has not yet been, appointed to the Observatory staff, on account of the difficulty experienced in finding a youth with sufficient technical knowledge and a bent for the work. A pressing need in connection with the Magnetic Survey is a redetermination of the magnetic elements at the principal seaports, as soon as the Director is free to undertake this work. The results are required to control the information supplied to the Marine Department and the Admiralty for publication in the " New Zealand Nautical Almanac " and Admiralty charts respectively. The publication of the results of the Milne seismograph at the Magnetic Observatory has been through the medium of the annual report of the Department since its inception in .1901 ; and, as it is desirable that the results of this instrument and the only other one in the Dominion at Hector Observatory should appear simultaneously, the late Mr. G. Hogben, C.M.G., Government Seismologist, was consulted with a view to this end, and also to adopt, for the convenience of other workers in this domain, the symbols of the international notation. Forms are now being prepared so that the earthquake records, commencing from the Ist January, 1920, will be uniformly presented,, and more frequently than in the past. A resolution of the Science Congress, 1919, "That, in view of the great scientific value of a knowledge of the variations of the electrical state of the atmosphere, this Congress desires to urge upon the Government of New Zealand the desirability of the establishment of an electrograph at the Christchurch Magnetic Observatory," opens up the question of the consolidation of the scientific work of the Department. It is inadvisable to install any more instruments at Hagley Park, as the electro-magnetic effect caused, by the electric haulage adopted on the Christchurch tram system interferes with the records, and the removal of the magnetic pavilion to Amberley, or both stations to a more suitable locality, is now under consideration. A reply to a request for an estimate of a duplicate of the atmospheric electric equipment proposed to be installed at Watheroo, Western Australia, from the Department of Research in

15

Tide Symbol. Auckland. A„=5-74ft. II K. Bluff. .I.unedhi. Lyttelton. A„= 5-:ix ft, A, :i-23ft. A„=8-20ft. H. k. H. k. H. Wellington. Wcstpoit. A„= 2-93 ft. A„=u-00ft. 11. k. H. «-. I " Short Period. SI S2 S4 SO Ml M2 SiWi Period. SI S2 S4 S6 Ml M2 M3 M4 M6 Ft. 0-009 0-597 0-019 0-002 0-011 3-794 Ft. o-oo9 n-o; 0-597 263-51 0019 336-51 0-002 50'9_ 0-011 141-81 3-794 204-01 0-048 204-05 0-110 127-8( 0-023 294-5E 11-03 203-50 336-59 50-98 141-89 204-00 >3 10 19 18 19 i0 i2 ,0 ■5 Ft. ° Ft. ° Ft. 0-005 37-07 0-016 294-24 0-036 13-01 0-500 49-07 0-251 125-38 0-156 140-07 0-008 219-59 0-000 318-00 0-013 141-01 0-005 167-31 0-005 60-00 0-012 358-98 0-011 55-20 0-004 177-98 0-015 89-84 2-876 35-00 2-535 121*48 2-893 122-20 0-005 257-21 0-019 270-94 0-014 121-43 0-098 230-63 0'255 174-01 0-009 82-32 0-085 76-40 0-082 355-52 0-021 62-21 Ft. ° Ft, 0-005 228-48 0-013 78-91 0-098 329-46 0'973 ! 333'10 0-005 188-20 0-007 74-38 0-005 309-32 O'OOl 28491 0-006 49-45 0-009 274-27 1-597 135-35 3-772 304-00 0-025 192-86 0-019 20502 0-037 286-46 0-066 43-12 0-016 100-77 0-025 42-14 M3 M4 M6 0-048 0-110 0-023 204-02 127-80 294-55 01 Kl K2 01 Kl K2 0-062 0-234 0-142 0-062 136-65 0-234 167-74 0-142 251-2 1 . 136-62 167-74 251-27 .2 4 7 0-100 77-38 0-088 74-47 0-080 58-82 0-004 110-78 0-062 90-01 0-153 85-34 0-080 79-73 0-086 130-04 0-047 91-54 0-105 34-45 0-100 54-47 0-080 79-98 0-078 191-40 0-040 340-07 0-267 325-79 PI Jl Qi PI Jl Qi 0-073 0-010 0011 0-073 107-01 0-010 214-2S 0-011 59-44 167-06 214-22 59-44 6 2 4 0-025 117-25 0-030 34-20 0-037 88-90 0-002 292-73 0-004 128-89 0-010 57-78 0028 38-97 0-029 279-75 0-016 33-31 0-030 i 67-31 0-032 135-24 0-000 ! 140-90 0-017 292-10 0-029 22-22 0-034 26-98 L2 N2 v 2 /j.2 T2 (MS)4 L2 N2 v 2 /j.2 T2 i (MS)4 0-190 0-781 0-202 0-104 0-077 0-176 0-190 212-64 0-781 169-01 0-202 180-OJ 0-104 168-04 0-077 103-24 0-176 193-71 212-64 169-09 180-03 108-04 103-24 193-71 4 9 3 4 4 1 0-132 35-76 | 0-116 102-80 0-115 116-54 0-670 14-55 0-540 104-75 0-659 89-04 0-068 05-08 0-043 166-50 0-095 146-37 0-073 349-29 0-017 329-09 0-109 47-85 0-020 84-48 0-027 66-95 0-027 201-80 0-083 1-08 0-113 140-70 0-103 145-33 0-055 140-74 0-093 266-08 0-389 99-07 0-715 287-35 0-108 109-38 0-077 340-77 0-081 I 86-45 0-104 268-47 0-040 308-20 0-027 350-59 0-036 134-01 0-104 299-09 (2SM)2 (2SM )2 i 0-003 0 063 307-32 307-32 0036 132-91 0026 357-73 0-102 2332 0-033 , 5-18 0-063 187-69 Long Period. Mm Mf MSf fJOTig Period. Mm I Mf I MSf I Sa I Ssa I 0-123 0-055 0-075 0-123 211-03 0-055 258-88 0-075 153-37 0-230 54-00 0-107 293-67 211-03 258-88 153-37 3 8 7 0 7 0-087 139-98 0-072 39-50 0-034 174-87 0062 153-21 0-073 181 TO 0-054 190-93 0-025 280-79 0-100 105-30 0-138 101-38 0-137 318-95 0099 213-18 0-107 30582 0-143 80-87 0-046 77-44 0-193 15205 0-087 ; 308-38 0-019 172-50 0-065 [ 158-15 0-031 343-12 0-098 ! 13-79 0-057 138-02 0158 I 192-55 0-099 181-17 0-073 j 191-54 0-058 67-82 Sa Ssa 0-230 0-107 54-00 293-67