380 REPORT — 1872. 



J. Speed (y+iT—nr). Q. Speed (7—3(7+^). 



6 



6 



1868-69. 1869-70. 1870-71. 



ft. ft. ft. 



El o-o8oo o'0434 o-o686 



61 i78°-s8 i65°-88 I4i°'37 



L. Speed (zy— <t— iir.) 

 ^ . ^ s, 



1868-69. 1869-70. 1870-71. 

 K^ o'o8o4 o'o365 o'o8a4 

 e^ io8°-67 J4o°-69 i29°-68 



X. Speed (27 — (T + -nr— 2)>). 



.^ «- ^ 



1868-69. 1869-70. 1870-71. 

 E2 o'o6i3 0-0381 00432 



e^ i56°-46 9i°-56 3o°-7i 



^ or 2MS. Speed (27—4(1+2);). 



. " s 



1868-69. 1869-70. 1870-71. 

 E.^ 0-0703 o'o333 0-0714 E.J 



«3 2690-99 227°-72 304°'53 «! 



E. Speed (27 — >;). 



1868-69 and 1869-70. 

 R3 0-0353 



Bj I2°-04 



43. Long-period Tides. 



1868-69. 1869-70. 1870-71. 

 ft. ft. ft. 



430-96 8o°-2o ,o°;'.J^} Solar annual (elliptic) tide. Speed (,). 



E 0-198 o'oS9 0-062 "I Solar semiannual (declinational) tide. 



6 8i°-98 ii6°-93 69°-69j Speed (217). 



E 0-076 o"043 0-032 "I Lunar monthly (elliptic) tide. 



332 "1 

 •90/ 



l75°-27 iis^-go/ Speed ((T — -nr). 



E 0-038 0-064 0-035 1 Lunar fortnightly (declinational) tide. 



6 33S°'40 333°"9i 2830-22 / Sj^eed (2(7). 



E 0-009 0075 0-058 "1 Lunisolar synodic fortnightly (shallow-water) 



c 326°-i9 i6°-98 156°-62J tide. Speed 2(17— ij). 



44. The epochs are reckoned from the meridian of Kurracheeforthc short- 

 period tides, and for the long-period tides from the time when the respective 

 argument of each tide equals 0°-0,- — ?*. c. for the solar annual and semiannual 

 tides from the mean vernal equinox, for the lunar monthlj- tide from the 

 mean perigee, for the lunar fortnightly from the time -when the moon's mean 

 longitude equals 0° and 180°, and for the synodic fortnightly from the mean 

 new and full moons. 



4.5. In addition to the foregoing reductions, a selection has been made from 

 the tide-observations taken during the construction of the Portland Break- 

 water, under the direction of Sir John Coode, from 1851 to 1871. The years 

 selected for reduction were 1851 and 1871, being the first and last years of 

 the observations at present taken, and the years 1857 and 1866, being the 



