"All right, then; we'll know soon."
For this purpose the largest compressed air container of all was to be employed. It distributed great volumes of compressed air to all the water tanks, forcing open the valves and driving out the water.
"Any of you youngsters know where the proper wrench is?" inquired the builder, looking keenly at the boys.
There was an instant start, followed by widespread pallor.
"Oh, it's not right to keep you in torment," laughed the builder. "I have kept the wrench in my pocket, all along."
He drew it out, holding it up before their gaze. Though technically a wrench, it looked more like a very large key. It was of curious construction, intended to supply the greatest amount of force with the least amount of exertion.
"Watch me," commanded Jacob Farnum. "Any one of you may have to use this wrench at any time."
Little did any of them guess the tragedy that was destined to center around that life-saving wrench later on. Now, with the boys gathered about him, Mr. Farnum fitted the wrench with great care and deliberation.
"See how easily it's intended to turn?" asked the builder, giving it a slight turn.
All three of the boys nodded.