Journal of the American Society of Naval Engineers, Incorporated (Volume 7) (Paperback)

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: by hydraulic gear. Besides these, there are six 6-inch breech loading rifles, two mounted forward inside the superstructure deck firing directly ahead, two abaft the cabins firing directly astern, and one on each side on the central superstructure deck. The lo-inch and the 6-inch guns can all be fired in broadside, throwing a weight of projectile on each side of about 2,400 pounds at one discharge. The 6-inch guns are worked by hand, on central pivot carriages, and are protected by steel shields, 2 inches thick. The secondary battery consists of seven 6-pounder Driggs- Schroeder rapid-fire guns; four i-pounder Hotchkiss; four i-pounder Driggs-Schroeder, and four machine guns (Gatling). There are four tubes for Whitehead torpedoes, two on each side, discharging directly from the berth deck. MACHINERY. Main Engines.?There are two vertical, inverted cylinder, direct-acting, triple expansion engines, placed in water tight compartments, and separated by a fore-and-aft bulkhead. The high pressure cylinder of each engine is placed aft and the low pressure cylinder forward, the latter being so arranged that it can be disconnected when working at low power and the high and intermediate pressure cylinders used under economical condition as a compound engine. All of the cylinders are steam jacketed on top, sides and bottom. The main valves are of the single ported piston type, made of composition, in two parts, and all interchangeable. There is one for each high pressure cylinder, two for each intermediate and three for each low pressure cylinder, all worked by Stephenson link motion with double bar links. The high pressure valves are fitted with balancing pistons working in cylinders cast on the upper cover of each high pressure valve chest, with live steam on the under si...