Page:Philosophical Transactions - Volume 002.djvu/41

 Ball (A) Lead (A) at 8 fathom and 1 foot, returned at 20; repeated at 8 fathom, returned at 19.

Tried the third time at 10 fathom and 4 foot, return'd at 28.

A fourth Trial, at the same depth, just the same.

A fifth, at 10 fathom, 5 foot, returned in 27.

A sixth Trial, just the same.

A seventh, at 12 fathom, 5 Foot returned in 37.

An eighth Trial, just the same,

Another Day, near the same place.

Note, That the Pendulum was this Day adjusted, and made a little shorter, there having been but 58 vibrations in a Minute, the other day.

Ball (A) Lead (B) at 14 fathom, returned in 32½.

A second Trial, a little after in the same place, returned in 33. In making of which Trial, the Vibrations were told aloud, and the Lead having been let down by a Line, was found to touch the bottom in just half the time, the Ball staid under water. By a second Trial, the ascending and descending was found to be in equal times. And by a third Trial with another Lead, the very same found, vid. 16½ descending, and 16½ ascending. This Lead and Ball let down without a Line, the Ball returned in 13 vibrations; a sign it went not to the bottom.

A Trial made with a Lead, whose Iron-Crook was fasten'd at the top of it (like that in the Figure 3) succeeded very well, and the Ball returned in 34½: But by reason of the Current, the Experimenters could not perceive, when the Lead touched the bottom. This Lead being let down without a Line, the Ball returned in 32½. The depth of the water was now found by the Ships Lead, to be 14 fathom.

Another Trial was made with a Line, bowing the point of the Lead (like that in the Fig. 4) and the Ball return'd in 34. The same let down without a Line, the Ball return'd in 6 or 7 vibrations; a sign again, it went not to the bottom.

In a Trial with another Lead, the Ball return'd in 34.

Repeated again with the same success. In