28'! REPORT — 1876. 



\. Speed {2y — (T+vr — 2r)). 



1868-G9. 1869-70. 1870-71. 1871-72. 1872-73. 



Ej 00613 o'ojSi 0-0432 0-0839 00750 



^2 J56°-46 9i°"S6 3o''-7i 29°-4o i94°-oo 



V. Speed (2y— 3(t— -or+2)j). 



1868-69. 1869-70. 1870-71. 1871-72. 1872-73. 

 Bj o'i955 00832 0-0814 o'i4i5 o-i88i 



63 255°"63 324°-40 345°'2o 285°-98 302°-o3 



/(. Speed {2y—4(T+2)]). 



1868-69. 1869-70. 1870-71. 1871-72. 1872-73. 

 Ha 0-0703 0-0333 0-0714 0-0617 °'0534 

 62 269^-99 227°-72 304°'i'3 i58°-49 a73°-84 



MS. Speed (4y— 2(t— 2;;). 



, ^ ^ 



1868-69. 1869-70. 1870-71. 1871-72. 

 R^ 0-0173 0-0236 0-0311 0-0195 

 e^ 2i6°-79 i8i°-3o 326°-55 o°-o5 



E. Speed (2y- 7/). 



1868-69 and 1869-70. 1870-71 and 1871-72. 



Rj 0-0353 0-0272 



63 I2°-04 32I°-23 



T. Speed (2y-3i;). 



^- ^ 



1868-69 and 1869-70. 1870-71 and 1871-72. 

 Rj o-iioS 0-0576 



62 38°-96 ioi°-70 



Long-period Tides. 



1868-69. 1869-70. 1870-71 

 ft. ft. ft. 



E 0-115 0'i79 0-162 



8o°-2o i07°'-i I ^^^^'^ annual (elliptic) tide. Speed (ij). 



£ 43°-96 



E 0-198 o'o59 0-062 "I Solar semiannual (declinational) tide. 



6 8i°-98 ii6°-93 69°'69/ Speed (21;). 



R 0-076 o'043 0032 "1 Lunar monthly (elliptic) tide. 



6 247°-73 175°'^? "5°'9°J Speed (ff—-nr). 



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



335°-40 333°'9i 283°-22 J Speed (za). 



0-009 °'075 0-058 "I Lunisolar synod: 



6 326°-i9 i6°-98 i56°-62j tide. Speed 2(cr—;/).' 



E 0-009 °'075 0-058 "I Lunisolar synodic fortnightly (shallow- water) 



Three years' tidal oliservations, taken at Fort Point (lat. 37° 40' N"., long. 

 gh gm s^ of Greenwich), San Francisco Bay, California, were received and 

 analyzed, with the following results : — • 



I 



