~ show : 
‘While stations at E, and “off Long Branch” lie quite to the south- 
A. D. Bache on the Tidal Currents of New York Bay. 335 
mean values. In table 2 the averages for the groups are given. 
From the first line of table 2 we find that about 56™ after the 
miles per hour, (in about three hours), and then decreasing (in 
about three hours) to zero, and turning to flood at about 14 
after the time of low water, the ebb thus being estimated at 
6h 19m 
Line 2 of table 2 gives the results from the middle group of 
ain 
a less velocity, and the flood a greater, than for the eastern group. 
The maximum velocity of ebb is 1:47 miles per hour, and of flood 
1°68 miles. The mean velocities of ebb 1-09 and of flood 1: 
obvious from an inspection of the type curve. It will be seen 
that the ebb is characterized by a uniformity of rate during the 
Second, third, and fourth hours of its existence, while the curve 
‘for the flood resembles the curve of sines. The ebb current 
turns earlier, lagging but 22™ after low water, thus turning more 
than 30™ before the corresponding currents to the eastward. 
_ The 8d line of table 2 shows the results for the western group, 
in the vicinity of South West Spit. Here the currents have a 
course round the compass, are much less rapid than the others, 
and are earlier. 3 : 
It would be curious to know where the earliest turning of the 
current is to be found, and, indeed, these results open up man 
questions in regard to the whole Bar and the channels throug 
ing the means of comparison of the normal currents sweeping by 
a of Sandy Hook with those secondary ones which we 
ail next proceed to trace. 
2. False Hook Channel and the Approaches. 
The current stations S, T, ©, D, G, F, and V, (see sketch 1), 
the movements of the water in this channel and its vicinity, 
ward. S, shows the action at the northern entrance, and V at the 
