"Four hours on, and four hours off, and the best quality of food are some of the recent improvements," said Siemens. George Ingram shook his head, and his heart ached as he witnessed the stokers, and resolved to do his utmost to mitigate the hardships of labor. "What are the duties of the stokers?" inquired George. "Our stokers," replied Siemens, "must be men of strength and skill, for they both feed and rake the fires. The ashes and slag must be hoisted and dumped into the ocean, and twice an hour, as the gauges indicate, fresh water is let into the boilers. Daily the boilers convert into steam over a hundred tons of water, which, condensed, is used over and over again." "What quantity of coal do you use?" "About three hundred tons per day, or an average of nearly two thousand tons per voyage. The coal carrying capacity of the "Campania," however, when needed as an armed cruiser, can be greatly increased." Siemens led Ingram to see the gigantic cranks, and propeller shafts. Each of the several cranks is twenty-six inches in diameter and weighs 110 tons; the shafts made of toughest steel are each twenty-four inches in diameter, and each weighs over 150 tons. The propellers are made of steel and bronze, and each of the six blades of the two screws weighs eight tons. It was now past two o'clock and George thanked Mr. Siemens and said he should be pleased to examine further his department when at sea. It was past three o'clock when George turned off his gas at the hotel. At eight o'clock the next morning the Harrises met promptly at breakfast. Promptness was one of Reuben Harris's virtues, and fortunately all his party were agreed as to its absolute necessity, especially when several journey together, if the happiness of all is considered. "George's eyes look like burnt holes," whispered May to Gertrude. Overhearing his sister's remark, George added: "Yes, May, and they feel worse after my two hours last night in the stokehole of the 'Campania.'" "We thought after our long railway ride and the concert yesterday, that you would gladly welcome a little sleep," said Gertrude. "I did sleep four hours, Gertrude, but my owl-visit to the steamer was highly instructive, and when we get to sea, you all will be delighted to help me complete the study of the marine engines on the 'Campania.'" CHAPTER XV A SAFE PASSAGE AND A HAPPY REUNION Gertrude and May never knew what happiness was before. One maiden had her lover, and the heart of the other was pledged to music. George too was happy in Gertrude's happiness and joyous in his own thoughts that perhaps he had already entered upon his life work, the development of plans which would bless humanity. Colonel Harris's chief joy was that he had earned a rest, was soon to see the absent members of his family, and to behold the work of men in Europe.