SEA-FISHEKIES LABORATORY. 427 



November 6th. — Neap tides. Wind, S. moderate. 

 "We dropped a float after the flood had been running an 

 hour. It passed about 60 feet off the end of the Literary 

 Institute, and 150 feet off Penhelyg Point, whence 

 it stood out to the south-east, and took a line up the main 

 channel, going aground at the spot indicated on the map, 

 the time occupied from the mouth of the sewer being 1^ 

 hours. No doubt, with the rising tide, the float would 

 have eventually proceeded further, but we were obliged 

 to leave it. 



Speed of current 540 yards per hour. 



November 26th.— Spring tides. Wind, W.N.W., 

 fresh breeze. The float was dropped on the flood tide 

 two hours or so after turn. It followed practically the 

 same line as on the 6th November, as far as Penhelyg, 

 but there, instead of standing out so far to the South, 

 took a line about 200 yards outside Trevri, in practically 

 a due easterly direction. 



November 27th. — Spring tides. Wind, S.W. light. 

 We released the float as soon as the flood tide began to 

 move, i.e., at 3.30. It passed within 20 yards of the end 

 of the Literary Institute, and at 3.55 passed within 

 10 yards of Penhelyg Point. Its progress past Penhelyg 

 was very slow, 20 minutes were occupied in covering 

 100 yards. Opposite Penhelyg tunnel, about 30 yards 

 from the shore, it was moving somewhat faster, but owing 

 to the failing light we were unable to follow it further. 

 Captain Lewis felt certain that it would have remained 

 close inshore as far as Trevri. Time from sewer to Pen- 

 helyg tunnel 50 minutes. 



Appended is a table showing the various sets of condi- 

 tions I was able to work. At springs I worked both ebb 

 and flood, at neaps only flood tides. I feel sure, however, 

 that the ebb of neap tides would have given me identically 

 the same results with the floats as already stated. 



DD 



