334 <A. D. Bache on the Tidal Currents of New York Bay. 
Art. XXXVII.—On the Tidal Currents of New York Bay, near 
Sandy Hook; by A. D. BacHeE, Superintendent United States 
Coast Survey. 
(Communicated by authority of the Treasury Department.) 
IN a former notice of the observations of tidal currents near 
Sandy Hook, I stated the general character of the results ob- 
tained, and their specific bearing upon the explanation of the 
growth of Sandy Hook, and of the changes above and below 
water in its vicinity. I propose now to describe more in detail 
the observations themselves, to discuss numerically and by the 
aid of diagrams the results obtained, and to show from them how 
the Hook is built up, the False Hook channel deepened, and 
Sandy Hook Bay modified in its shore line, and especially in the 
configuration of the bottom. Sketch No. 1 shows the current 
stations occupied on the outside of the Hook, and in False Hook 
channel and the approaches, in the different parts of the Main 
Ship channel and its approaches, and in the eastern, middle, and 
western portions of Sandy Hook Bay. 
It will be convenient to discuss the subject under the three 
divisions already referred to of (1) the normal currents in the 
main ship channel and its approaches, of (2) the currents of False 
Hook channel and the approaches, and (8), the currents of Sandy 
Hook Bay. : 
1. Normal Currents at the Entrance to New York Bay. 
prehending the positions Re R, Q and H, shows the currents at 
dle, embracing the stations P, O, I, A,, A,, lying for the most part 
between the eastern portions of Flynn’s Knoll and the point of 
dy Hook, shows the currents of this part of the main ship 
i - Be gives the currents 
sketch 1) also exhibits the 
type form of the tide wave as observed at Sandy Hook. The 
tions, localities, luni-current 
wave, velocities and direc- 
