I have got a fresh hold.

Do you shift yours." Again the effort was made, and this time the nails drew fully two inches.

Another effort, and the plank was completely free at the lower end.
"Now do you push against it as hard as you can," Francis said, "while I get my iron in between it and the beam above." The upper nails yielded even more easily than those below.
"No farther," Francis said, when they had fairly started them, "or the plank will be falling with a crash.

We must push from the bottom now, until it gives sufficiently far for you to get an iron down each side, to prevent its closing again." "Now," he said, "push the irons higher up.

That is right.