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1901.] MARINE REVIEW. 25 ST. JOHN GRATE AND BEARER BAR. The St. John grate and bearer bar, illustrated herewith, has been used with great success on a large number of battleships and cruisers built at the works of the Cramps, Philadelphia, and also on several large merchant ships built at the same works for the International Navigation Co. It is also in use in stationary plants all over the country and in hundreds of vessels other than those referred to above, but the Cramp ships are spoken of on account of their prominence. The naval vessels include the cruisers New York, Columbia, Brooklyn and Minneapolis of the United States navy; battleships lowa, Indiana, Massachusetts, Alabama and the new Maine of the United States navy; cruiser Kasagi of the Japanese navy; cruiser Variag and battleship Retvizan of the Russian navy. Edwin S Cramp, superintending engineer of the William Cramp & Sons company, says: "We have used the St. John grate bars and bearers on several vessels built by us for the United States navy, on the cruiser Kasagi for the im- perial Japanese navy, on vessels for the Russian navy, and on a great number of merchant vessels in the transatlantic service. During the official trials of these vessels we were able to maintain a uniform steam pressure for the entire period, and at no time did we find it necessary to clean fires by hand, all the refuse being broken up and passed through the bars by shaking, thus avoiding the injurious consequences liable to ensue from keeping the furnace doors open too long. The work of the firemen is minimized, and the fires are kept in good condition for their entire length. When the ships returned to our yard and after the furnaces were all cleaned, a close examination was made, and all the bars were found to be in excellent condition. This we consider remarkable, as during the trials , the pressure in the fire rooms averaged from 9-10 in. of water on some of the vessels to 244 in. on others. It is the best shaking grate bar we have ever seen." The manufacturers, St. John Grate & Bearer Bar Co., 1225 Betz build- ing, Philadelphia, make the following claims: "Owing to their construction, these bars will burn more coal per square foot of grate than any other bar with the same draft conditions. They will save labor in that 'prick' bar need not be used. The slicing is reduced one-half, and the number of regular cleanings reduced two-thirds or more. Coal is burned more economically, owing to the peculiar con- struction of the bar, and the clinker is kept from forming, and drops to the ashpit, thus leaving a good open fire at all times. Clinker cannot fasten to the bar on account of the corrugated surface forming the face of the bar, and the air is administered in such a way as to make it brittle and easily broken. Each bar works independently, thus allowing grate action upon any part of the fire. Even with the intense heat secured by the peculiar construction of these bars, the moment the ash and clinker begin to form it rests upon the peaks of the corrugations, and the air admitted under clinker and between the peaks prevents the bar from becoming heated, thereby prolonging the life of the bar indefinitely. As the clinker cannot fasten in the bar, being easily shaken into the ashpit, the fireman is not discouraged from using the shaking movement, as in the case of so many so-called shaking grates, where the clinker jams and a man is not able to move the bars at all. As these conditions do not exist, and the bars are easily shaken at all times, a fireman is much more apt to keep his fires clean, and so reduce the cleanings as much as possible, thus making his work easier and prolonging the life of the bridge walls as well as side walls, and the fact of the fire-door not being open as much as in ordinary cases, causes a reduction in the repair bill to the boiler itself in removing strains due to sudden contractions from the influx of cold air and the resultant saving of fuel in this one way is considerable." A catalogue (D) just issued by the Cleveland Pneumatic Tool Co., Cleveland, O., deals with its hammers, riveters and drills. It is most excellently illustrated and printed. In its introduction the company says that while the pneumatic tool has been known in a limited way for many years, the tool of this kind that is now being offered as an adjunct to the machinery equipment of all up-to-date shops and factories might properly be classed as a modern device. The evolution of development in perfect- ing these tools duxing the past four or five years has been characterized by tremendous strides and lightning changes. As a means of cheapening the cost of production and at the same time aiding in the rapidity of filling -contracts, giving to the consumer a product of the highest grade, pneu- matic tools occupy a field separate, alone and unapproachable by any mechanical device now known. The company claims to be able to furnish the most reliable tools that genius and skill have yet produced. The company will furnish its tools on trial. "Little Gian " Pneumatic Hammers have gained an enviable reputation for efficiency and durability in all parts of the world. They are particularly adapted for use in Ship Yards. Use 50% less air and do far more work than any other make on the market. You will make no mistake if you order a "LITTLE GIANT." Any mechanic can make the occasional repairs required. Unexcelled for all classes of Riveting, Chipping, Calking, Beading, etc. : WRITE FOR CATALOG Acme of Pneumatic Tool Construction. NO Size 000 Adapted to Riveting up to 1% inches. Size 00 Adapted to Riveting up to 1 inch. Size 0 Adapted to Light Riveting. Size 1 Adapted to Extra Heavy Chipping. Size 2 Adapted to Chipping and Heavy Calking. NO Size 3 Adapted to Light Chipping, Calking and Beading Flues. Size 4 Adapted to Beading Flues and Calking. Size 5 Adapted to Beading, Light Calking and Chipping. Size 6 Adapted to Light Chipping and Sealing. PARTS. VIBRATION. DELICATE ie ae Sent on trial and express paid both ways if not satisfactory. We manufacture the largest variety and best Pneumatic Tools on the market. General Offices and Works : AURORA, ILL. STANDARD PNEUMATIC TOOL COMPANY, Manufacturers of Air Drills, Hammers, Reversible Flue Rolling, Reaming, Tapping and Wood Boring Machines, Motor Chain Hoists, and Pneumatic Tools and Appliances of Every Description. Eastern Offices: 141 Broadway, NEW YORK.