338 A. D. Bache on the Tidal Currents of New York Bay. 
exhibited by diagram 2, (sketch 3). The currents are northward, 
(with velocities of 1- and 0°3 miles per hour, at stations near to an nd 
— remote from the main ship channel), in the eastern, south- 
estwardly — pear in 0:3) in the middle; and westwardly 
(with velocity 0:4) in the western section of the Bay, while = 
current va the main ship, channel now at its maximum, hol 
course west, with a velocity of 1-9 miles per hour. me 
still, we find this whirl, heretofore elliptical, assuming a m 
circular form. At 6» it has extended to the middle section of the 
Bay, so the currents of that region, (see diagram 3, sketch 
8). Its axis still moves to the southward, and at 6» there occurs 
a space of ens water, near the point of Sandy H ook, where we 
at first noticed the existence of - whirl that we have followed. 
— — es ~< ne rapidly in the main ship chan- 
estern section of the Bay, and at 7" we 
fiend at the 9th hour) the wat f y press into 
Sandy Hook Bay, sien: escaping oaca:t the shore of yi Hook, 
rush into the a channel, causing a rip and counter drift at the 
channel slackens. The ebb (northwardly) is the dominant cur- 
rent in the eastern section of Sandy Hoo. Stes it 
Fines ail three hours before the flood of the ship channel slackens. 
t is evident that this earlier drift is the lateral draught created 
the stream of the ship channel, since as we have previously 
wn, its domain increases with the velocity of the main stream, 
and it prevails generally in the eastern section of the Bay, when 
the main stream has reached its maximum velocity. Moreover, 
our several stations show that the duration and velocity of this 
Seahpamed tance from 
_ Limes land 4 of table 6 give the averages of th 
ies ‘st several stations as a ale of eb against 04 of od, 
