“We—we seem to have stopped,” I said.

“Yes,” snapped Hawkins.

“What was it? Do you suppose anything was sticking out into the shaft? Has—can it be possible that there is anything like a mechanical error in your Hydro-Vapor Lift?”

“No! It's that blamed fool of an engineer!”

“What!” I exclaimed. “Do you blame him?”

“Certainly.”

“But how was it his fault?”

“Oh—you see—bah!” said the inventor, turning rather red. “You wouldn't understand if I were to explain the whole thing, Griggs.”

“But I should like to know, Hawkins.”

“Why?”