is a room similarly fitted up for the engine cleaners. Although these works are fraught with many dangers, it is rarely that any serious casualty occurs. District Loco. Superintendent, Albany Richardson, Esq.; Assistant Superintendent, Mr. John Richardson. There are two gauges known as the Stephenson or narrow gauge, 4-ft. 8½-in., and the broad gauge 7 feet between the rails introduced by the younger Brunel on the Great Western Railway. The locomotives on the Brighton and South-Coast Railway are constructed for the narrow gauge. The "Kensington," No. 205, belonging to the London, Brighton and South-Coast Railway Company, is a four-wheel coupled engine, designed by W. Stroudley, Esq., Locomotive Engineer. Diameter of cylinders, 17 inches; stroke, 24 inches; diameter of driving and trailing wheels, 6 feet 6 inches; leading wheel, 4 feet 3 inches; wheel base, 16 feet 3 inches; number of tubes, 260; diameter of ditto outside, 1½ inch; length of ditto, 10 feet 11¾ inches; area of fire-grate, 10.25 square feet; pressure of steam, 140 lbs. per square inch; tube surface, 1,125 square feet; fire-box surface, 112 feet; total surface, 1,237. The total weight of this class of engine and tender when loaded is about 50 tons, and will convey a load of 236 tons at a speed of 40 miles an hour. This class of engine was constructed for running the express traffic, which in the season is very heavy on this line. Cost of engine about £2500. "A pint of water is converted into two hundred and sixteen gallons of steam by two ounces of coal, and has sufficient power to lift thirty-seven tons; the steam thus produced has a pressure equal to that of common atmospheric air. By allowing it to expand, by virtue of its elasticity a further mechanical force may be obtained, at least equal in amount to the former. A pint of water therefore, and two ounces of coal are thus rendered capable of raising seventy-four tons a foot high. Two hundred feet of steam can be condensed in one second by four ounces of water, and their expansive power reduced to one-fifth." The first person who sought to apply the expansive force of steam as a motive power to machinery was an Egyptian, Hero of Alexandria, who lived about 15 years before Christ. In the year 1543, Basco de Garay, a Spanish captain, astonished the world by asserting that he would propel a vessel without sails or oars. The Emperor Charles V. ordered the experiment to be made, and on the 17th of June a vessel called the "Trinity," of 200 tons burden was moved by wheels turned by steam at the rate of two leagues in three hours. To Spain belongs the honour of having invented the first steam vessel.