(443)
In a Trial with a Lead, whose Nail was set awry (like that of the Fig 5.) the Ball returned in 34. After which Trial the depth was found to be just 14 fathom.
The last Lead and Ball being let down without a Line, the Ball returned at 35.
In another Trial with a Lead that never failed, the Ball returned in 34, and the Lead toucht the bottom at 17.
By a Trial with another Lead, the same time was found exactly.
By a third Trial with this last, the very same.
These Trials were made near about High-water, at the depth of 14 fathom just by measure: And in them, the motions seem to be 5 foot every second.
In all these Trials, the greatest difficulty was, in the use of Conical Figures, with Iron Crooks, to bend the Iron, that it might be sure to carry down the Bill with it to the bottom, and when come thither, to let it go: for almost every one of these Leads failed in one of these requisites, till by several Trials they had been adjusted.
It is not to be omitted, That the last Trials being made near High-water, the Ball was found to rite (by the Boat, being permitted to drive) far off upon one side, out of the way, that any light thing, suffered to swim on the water, would be carried; which seemed to argue a motion of the under parts of the water, differing from that of the upper (a thing which is said to be at certain times of the Tydes, both at the Mouth of the Sound, and of the Streights; which deserves to be further inquired into.) The
Angle made by these different motions, seemed to be about 40 Degrees.
