134 



TIDES. 



[Sect. IV, 



regular law, the best way is to put them into a curve 



s^ 



fetting off the lunitidal interval belonging to each tide as 

 an ordinate, as in fig. 2.* If the curve drawn through 



ol- 



Times II, W, 





I 



t 



30>n 



2Ht 



j%j^ 



. < 



\h 





T 



Jan. 11, IS, 13, 14, 15, 16, 17, 18, 19, 20 



o 



Full Moon. 



tiie extremity of the ordinates be tolerably regul 

 tides may be presumed to be so. 



15. In the observations given in Art. 13 we may see 



Iiow loose a term the " estaUishment " is. The 1 3th is 

 the day of full moon, for in the course of that day the 

 moon is 12 hours from the sun. The time of high water 

 on the 13th is— a.m.., 2h. 11m.; p.m., 2h. 29m. ; and 

 either of these might, in the common use of the term, be 

 called "' the establishment." 



16. If the lunitidal intervals be set oft" for a fortnight 



! 



I 



sect. 



IV-] 



or 



inoi*^ 



i. 



Thi3< 



V^y 



at any ] 



lace 1)1 



1 



P 



17. J 



of takii 



fig. 2, V 

 transit ; 



./ 



J" 



6k 



^ A 



curve \ 

 Oh. 



or 1 



111 



e 



In actual practir-e it -vfill be better to draw the figures on a larger 

 scale than those here ^iven. 



boon's tv 



