four o'clock
At last Minnie bade Ruby a final good night and went below , and Ruby , who could not persuade himself that it was final , continued to walk the deck until his eyes began to shut and open involuntarily like those of a sick owl . Then he also went below , and , before he fell quite asleep -LRB- according to his own impression -RRB- , was awakened by the bell that called the men to land on the rock and commence work . It was not only Ruby who found it difficult to rouse himself that morning . The landing-bell was rung at four o'clock , as the tide suited at that early hour , but the men were so fatigued that they would gladly have slept some hours longer . This , however , the nature of the service would not admit of . The building of the Bell Rock Lighthouse was a peculiar service . It may be said to have resembled duty in the trenches in military warfare .