The Main Building was the largest edifice in the world. It was 1,876 feet long and 464 feet wide, covering 21½ acres of ground. In the centre were four square towers, 120 feet high. The facades at the end were 90 feet high, and the corner towers 75 feet. The central aisle was 1,832 feet long, 120 feet wide, and 70 feet high. The framework was of iron, filled in with wood and glass. Nearly one-third of the space was occupied by American exhibitors. Great Britain and her colonies occupied the next largest area, with a display of enormous proportions and dazzling brilliancy. A single firm of silversmiths sent half a million dollars’ worth of wares. France and her colonies and the German Empire were also splendidly represented. Other conspicuous exhibitors were Holland, Belgium, Austria, Russia, Spain, Japan, Sweden and Norway, Italy, and China. Mexico, Brazil, Switzerland, Portugal, Egypt, Turkey, Denmark, Tunis, Chile, the Argentine Republic, Peru, the Orange Free State, the Sandwich Islands, and Venezuela were also represented. Never before had there been gathered together in one place such a comprehensive display of the arts and industries of so many of the peoples of the world. Machinery Hall, which was especially devoted to machinery in motion, was 1,402 feet long and 360 feet wide, with an annex 208 by 210 feet for hydraulic machinery. There were more than 10,000 feet of shafting for conveying to the various machines the motive power generated by the huge Corliss engine. This enormous machine had cylinders of 44 inches diameter, and ten feet stroke, a fly-wheel 30 feet in diameter, and 56 tons in weight, making 36 revolutions per minute. There were 20 tubular boilers of 70 horse-power each, and at 60 pounds pressure the work of the engine was about 1,400 horse-power. This building contained by far the largest and most varied display of working machinery that had at that time ever been seen in the world. Horticultural Hall was a graceful Moorish palace, largely built of glass, and contained a magnificent exhibit of trees, shrubs, and flowers from all parts of the world. Agricultural Hall consisted of a nave 826 feet long and 100 wide, crossed by three transepts, each 465 feet long, and from 80 to 100 feet wide. The inclosed space was about 12 acres in extent, and it contained a marvellous display of agricultural implements and products from all parts of the world. Memorial Hall was intended as a permanent building, and was constructed in substantial manner of granite, glass, and iron. It is 365 feet long and 210 feet wide, with a square tower at each corner, and a four-sided dome at the centre. Besides these buildings the United States Government erected a vast structure, 360 by 300 feet, for the display of the operations of its various departments; many foreign governments had buildings of their own; so had more than a score of the States; and there were also buildings for the Judges, and for a great number of special industries.