"The Lunar Eighth Ray tank is of sufficient capacity to keep us off the Moon," I said. "If it has not been tampered with, we should be in no danger of falling to the Moon's surface."
"If it has not been tampered with, sir; yes, sir, that is what I have been thinking."
"But the gauge here shows it full to capacity," I reminded him.
"I know, sir," he replied, "but if it were full to capacity, we should not be falling so rapidly."
Immediately I fell to examining the gauge, almost at once discovering that it had been tampered with and the needle set permanently to indicate a maximum supply. I turned to my companion.
"Mr. Norton," I said, "please go forward and investigate the Lunar Eighth Ray tank, and report back to me immediately."
The young man saluted and departed. As he approached the tank it was necessary for him to crawl through a very restricted place beneath the deck.
In about five minutes Norton returned. He was not so pale as he had been, but he looked very haggard.
"Well?" I inquired as he halted before me.
"The exterior intake valve has been opened, sir," he said, "the rays were escaping into space. I have closed it, sir."
The valve to which he referred was used only when the ship was in dry dock, for the purpose of refilling the buoyancy tank, and, because it was so seldom used and as a further precaution against accident, the valve was placed in an inaccessible part of the hull where there was absolutely no likelihood of its being accidentally opened.
Norton glanced at the instrument. "We are not falling quite so rapidly now," he said.
