TIDES AND CURRENTS IN BOSTON HARBOR 51 



Table 3. — Mean high and low water referred to sea-level datum, Boston Navy Yard 



1 Records for year incomplete; see note 1, Table 2. 



Above table is derived by referring the values in Table 2 to the sea-level datum defined on p. 41. 



Mean high water from entire series =4.81 feet above sea-level datum 



Mean low water from entire series =4.93 feet below sea-level datum 



Mean high water (corrected for longitude of moon's node). =4.80 feet above sea-level datum 



Mean low water (corrected for longitude of moon's node) =4.91 feet below sea-level datum 



Table 4. — Mean range of tide, Boston Navy Yard 



» Records for year incomplete; see note 1, Table 2. 



Mean range of tide from entire series ~n^f ?®5 



Corrected mean range from entire series =9- 71 feet 



The first column following the year contains the mean range of tide as directly obtained from the observa- 

 tions; in the next column are given the factors for correcting for the longitude of the moon's node; and in 

 the last column the mean range as corrected by this factor. 



