While he had been watching, his two comrades had, under his instructions, been unravelling a portion of one of their blankets. When enough thread had been obtained, the strands were tied together and doubled, and Desmond had little doubt that it was sufficiently strong to draw up the string Mike would bring with him. He now took another portion of the bill, and pricked upon it the words:
At nine tomorrow night, bring, if possible, fine steel saw, two files, and small bottle of oil. Fasten these to string we will lower with further instructions.
He then opened his coatee, took out some of the white wool with which it was padded, formed this into a loose ball, in the centre of which the note was fastened, and all being in readiness, waited patiently, until, just as the city clock struck ten, they heard a low whistle. The ball had already been attached to the end of the thread, and Desmond at once lowered it down.
Presently, they heard another whistle and, hauling at it again, they found that the ball had gone, and attached to the end of the thread was a very light silken cord, which they drew in. There was another low whistle, and all was silent.
"So far, so good," Desmond said. "We are fairly on our way to liberty. How long do you suppose it will take us to cut through these bars?"
"It would take us a long while to file through them all," O'Neil said, "but with a fine steel saw, I should think that a couple of nights' work should do it. But of course that is mere guesswork, for I have not the least idea how fast even the best saw could cut through iron."
"Well, there is no particular hurry, for we know that no day has been fixed yet for our trial. So, whether it is one night or six, it does not matter much."
On the following evening at nine o'clock the whistle was heard, and another ball lowered down at the end of the string. The instructions this time were:
When we are ready, we will show a handkerchief at window. Bring with you, at nine that evening, rope strong enough to bear us, and have disguises for three ready for us at foot of wall. Herewith are ten louis to purchase three disguises.
The cord brought up a small packet, which contained two very fine small steel saws, two files, and the oil. They did not lose a moment in setting to work, and, oiling the saws, one began to cut through the central bar, just above the point where the lowest cross bars went through it, as they determined to leave these to fasten the rope to. There was not room for two of them to work together, and they agreed to take it by turns, changing every quarter of an hour.