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512 plate. This opens communication be- tween numiber one collecting nozzle ana the main blowofi pipe: The pressure on the boiler and the shape of the collecting nozzle produces a current around and into the collect- ing nozzle. These currents produce a sweeping action extending approxi- mately six inches on each side of the collecting nozzle. When all the sediment and small pieces of scale are removed from this part of the boiler, the handle is turned until the pointer is even with the next number on the dial, the operation is repeated and so on until a complete revolution has been made. In this way the sediment and scale forming THE MARINE REVIEW November, 1919 ingredients are re- moved from the bottom of the boiler. This device is in operation on a number of Great Lakes vessels. An- other recent in-- novation on Great Lakes' vessels is the use of super- heated steam in order to secure a substantial in- crease in the horsepower per ton of fuel. Super- heated steam is CONDUCTORS Bt gees tO. LUZZC 17 PIlOT H1OL/Se Acer FIG. 14 at the present time giving good results in land installa- tions and it is predicted by some lake engineers that it Ground : Berger LDaxed Up will be used almost universally on the lakes within the next 10 years. To safeguard sea- men during heavy weather is a problem that has been closely studied on the Great Lakes. In considering lake vessels, it must be borne in mind that they are: not equipped with comparatively high bulwarks as are ocean going craft. On the other hand, the only protection to prevent members of the crew from being washed overboard is a light wire railing. Thus going fore and aft on a lake vessel during a heavy sea is not accomplished without diffi- culty and some danger. It is not practicable to connect the forward and after decks with a bridge due to the fact that open space above the cargo | Freeverse Shaft 5 © ¢? %. oS ELECTRIC ENGINE ROOM ALARM--A BELL RINGS IN THE ENGINE ROOM AND IN THE WHEEL HOUSE If THE TELEGRAPH ORDERS ARE NOT CARRIED OUT ~ COLLECTING NOZZLES VALVE CHAMBER BLOW OFF VALVE J DIAL : POINTER | HANDLE SURFACE BLOW _ APPARATUS FOR INSURING PROPER CIRCULATION OF WATER IN SCOTCH _ MARINE BOILERS hatches is imperative. To allow mem- bers of the crew to move fore and aft in perfect safety, all lake vessels now carry a stout wire cable located well above the deck. Seats patterned after an ordinary boatswain's chair traverse this cable enabling the man who happens to be aft and wishes to go forward in heavy weather, or vice versa to make the journey in absolute safety. Due to the length of the largest freight boats, some 600 feet, the word journey can be taken literally. To Build Terminal Plans have been drawn for a new terminal to be built at Baltimore on the south side of the Patapsco river. Eight piers, 1800 feet long and 300 feet wide with 400-foot slips between will be constructed.. The piers are to have double-decked sheds with adequate equipment of electric cranes and con- veyors. Each pier will be served with five railroad tracks. To accommodate small manufacturers whose materials are imported, manufacturing buildings to be built near the pier have been pro- jected. It is 'said 'that construction work will begin within a short time. F. W. Kassenbaum Jr. is the engineer in charge. Barclay, Curle & Co., Ltd., shipbuild- ers and engineers, Whiteinch, Glasgow, Scotland, constructed the hull of the motor vessel GLENAPP, a description of which was published in the September issue of THE Marinr Review. In that article, Messrs. Harland & Wolff, Ltd., Belfast, Ireland, were listed as the builders of the vessel.