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Practical Ideas for the Engineer Propelling Equipment of New American Scout Cruisers De- signed for 35-Knot Speed--Plan to Improve New York Harbor HE light cruisers now under con- struction for the United States navy will be the most effective scouting vessels built by any nation. They will be swift enough to -out-run almost anything afloat; large enough to keep their speed in heavy seas; roomy enough to rush detachments of marines o "trouble spots'; and. powerful enough to overwhelm destroyers and other light craft. These cruisers have a length of 550 feet, beam of 55 feet, displacement of 7100 tons, a maximum speed of 35 knots, and a complement of 330 officers and men. They carry 12 of the new 53-caliber,. 6-inch guns, turrets forward and aft; torpedo tubes and antiaircraft guns. Light but efficient vertical and _ hori. zontal armor protects the machinery spaces. A new feature, never before incorporated in any ship of the powerful military type, is the complete equip- also they have FIRST OF THE SCOUT CRUISERS, UNCLE yards mounted in. ARRANGEMENT OF THE PROPEL- LING MACHINERY OF THE NEW SCOUT CRUISERS BUILDING FOR THE "UNITED STATES NAVY ment on each ship for launching and operating four hydroairplanes. Ten of this class are called for on the present program; and of these, three--OMAHA, MILWAUKEE, and CIN- CINNATI--are nearing completion at the of the Todd Drydock & Con- struction Co., Tacoma, Wash. Propelling Machinery Interesting as these vessels are as naval units, they are perhaps even more so from the standpoint of steam engineering, since each is to be driven by geared turbines having a total capac- ity of 90,000 horsepower. Each ship has four 22,500 horsepower cross-com- pound Westinghouse turbines, and each turbine is geared to a propeller. Each turbine consists of a high pres- sure and a low pressure element which drive the propeller through a common gear. An astern turbine, is incorporated in each low pressure element... Whea supplied with the same amount of steam as for full ahead operation, the astern a ai ee 197 turbines can develop 30 per cent of the full ahead power. (The reduction gears are of the West- inghouse floating-frame type. Each has two pinions, one for the high-pressure and one for the low-pressure rotors, and a single gear wheel connected to the propeller shaft. The main turbines can propell the ship at speeds ranging from.12 to 35 knots, but as only a_ relatively small amount of power is needed for low speeds, small auxiliary turbines are used for cruising purposes. There are four of these cruising turbines per ship and each consists of a single-row im- pulse wheel and can develop 420 horse- power at 6000 revolutions per minute. Each cruising turbine is mounted on an extension of the case of a main high- pressure element and can be coupled to the high-pressure rotor through a gear giving a speed reduction of 6 to 1. Air ejectors and air separators are : Sha ec ce et a SSS SAM'S NEWEST TYPE OF HIGH SPEED FIGHTING SHIPS