MANUAL OF TIDE OBSERVATIONS 



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the morning tides Avill be entered on the first line and the afternoon 

 tides on the second line for the day. Blank spaces should be 

 left for tides missin<r because of lost record in order that inferred 

 values may later be interpolated if desired; but when only a single 



Iff^^ TIDES: HIGH AND LOW WATERS 



Kd. t\i\. Iy2a 



Siaiion: j^ Pn^ IP,, fAj rj.aJi^.n/ial irm^. 



Highta tide: Da:c l^^-lj- /3*'^ lUjghl ZO-2. /,, Li,^i.si ,,J,-; Da!e 



(K,+0,)-hM; or 2(OHQ+ DL0^.\/n=_J_- 2. riMn)=l-00'^ .F,=- 0- SS 



. Heishi j-- L 



Figure 25. — Form 138, high and low waters (back). 



high or low water actually occurs on any calendar day, the unused 

 space may be filled with a dashed line. 



215. In selecting the time of high or Ioav water from the tide curve 

 attention should be given to the general trend of the curve rather 

 than the individual peaks arising from various causes. The aim 



