38 



Comparison of densites — Pocomoke. 



[The figures show the excess of density over that of distilled water, which is represented by 1,000.] 



Bed. 



Maximum density. 



Tide. 



Remarks. 



a 



i 



5 



Minimum density. 



Tide. 



Remarks. 





1.0160 



1. 0170 



1. 0174 

 1. 0172 

 1.0175 



1.0173 

 1. 0167 

 1.0172 

 1. 0169 



High water and one- 



quarter ebb. 

 One-quarter flood .. 



Three-quarters ebb 

 One-half flood 

 One half ebb 



One-half ebb 



High water 



One-quarter ebb . . 



Three -q u a if ers 

 flood. 





.0047 



.0014 



.0014 

 .0004 

 .0015 



.0007 

 .0007 

 .0009 

 .0005 



1. 0113 



1.0156 



1. 0160 

 1.0168 

 1.0160 



1. 0164 

 1. 0160 

 1. 0163 

 1. 0164 



Low water 



Tlirce-quai (ers Hood 



One-quarter flood . .. 



One-half ebb 



Three-quarters ebb 



Low water 



One-half flood. 



One-half flood 



Low water 





and Slatestone. 

 Shell Bed and above ... 



14 feet ; calms and light 

 breezes several days. 

 18feetandsameasaboi e 

 15feetaud.siuue as above 

 4 fathoms and same ;is 



above. 

 17feetandsame as above 

 9 feet ; light breezes . . . 

 12 feet; light breezes . . 

 11 feet ; light breezes . . 



5 feet. 



Strong easterly breezes. 

 15 feet : light breezes. 

 18 feet ; mouth of Guil- 

 ford Creek. 



Bird and Hern Island 

 Beds. 



Guilford Creek 



Brig 



Head of creek. 

 Light breezes. 

 17 feet ; light breezes. 



CURRENTS. 



Over the Pocomoke beds the general set of the ebb current is westerly until it reaches the 

 shoal between and south of Broad and Ape's Hole Creeks, where it turns to the southward into 

 the main channel. The majority of the observations of the ebb current were made during moder- 

 ate northeasterly breezes, but the direction seems to have been but little influenced by them, 

 though the strength probably was; as at high and low water by the tide tables, when there should 

 have been no perceptible current, one was observed of from 0.1 to 0.2 of a mile an hour. The max- 

 imum strength observed was 0.5 of a mile per hour. The flood current sets northeast over the 

 beds, and has a maximum strength of 0.5 of a mile per hour, and is but very slightly influenced in 

 direction by the wind. 



In the main channel of the Sound, below the Shell Rocks and over the Muddy Marsh Rocks 

 the flood current sets to the northward, following the general direction of the channel. The max- 

 imum strength of this current, when uninfluenced by the wind, was 0.45 of a mile per hour. No 

 observations of the strength of the ebb current were made in the main channel; but it is probably 

 equal, or of slightly greater strength, than the flood, and sets to the southward. 



Over the Bird and Hern Island Rocks the flood current sets to the northward and eastward 

 into Mesougo and Guilford Creeks, with a maximum velocity, when uninfluenced by the wind, of 

 0.24 of a mile per hour. The ebb sets to the southward and westward, curving to the southward 

 us it becomes influenced by the main current, with a maximum velocity of 0.4 of a mile per hour. 



North of the Guilford Flats the flood sets northeasterly toward Muddy Creek. The maximum 

 velocity observed during light northerly breezes was 0.3 of a mile per hour. South of the Guilford 

 Flats the current follows the general direction of the channel, the flood having a tendency towards 

 Hunting Creek, where the channel into Guilford Creek joins the latter. The maximum velocity 

 observed during light northerly breezes was 0.5 of a mile per hour. 



The ebb out of Mesongo and Guilford Creeks sets to the southward and westward, following 

 the channel until it readies the Bird and Hern Island Beds, where it curves to the southward. Its 

 maximum velocity was 0.4 of a mile per hour. The current over the Brig and Parker's Beds sets 

 to the northward and to the southward; the maximum strength of the flood, when uninfluenced by 

 the wiud, was 0.24 of a mile per hour, but a moderate breeze appears to be sufficient to cause a 

 marked increase of strength and change of direction. Off the mouth of the Chesconessex, where 

 the wiud, though light, had the width of Chesapeake Bay and both Tangier and Pocomoke Sounds 

 to sweep over, the flood tide on the third quarter had a set to the northward and eastward of 0.4 



