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~ substitute. mechanical skill for the 50 SMOOTH ON. Mr. S. D. Tompkins, president of the Smooth-on Manufacturing Co., Jersey City, N. J., recently delivered an dress before the Modern Science club, Brooklyn, N. Y., on:the 'subject. of Smooth-on. He said: It is not my purpose to make an ad- dress to you on the subject of iron ce- ments. Only a plain talk on the uses, adaptability and method of application of smooth-on iron cement. It is a metallic, atomized iron in a compound that hard- ens when saturated with water and thor- oughly kneaded into a compact homoge- neous mass and put into a hole, crack or small crevice fills it with iron that lays up to the surface so close that the slight expansion of the cement forces it into the grain of the iron. It is useful for mechanical purposes. Its first use was principally for cover- ing blemishes and sometimes to conceal faults in iron and steel castings. And it was often misused, as the temptation was to cover faults in poor foundry work. Today ioundrymen find it better practice to cover blemishes and faults. While we don't believe it best to publish every repair that is made to an engine, boiler or machine, we cite a few cases that we know can do no harm to anyone. Sometimes we hear it said that the use of smooth-on iron ce- ments is only a makeshift. That it only serves as an expedient, adapted to serve a ptfesent need or turn. -A temporary We will answer this as fol- lows: When tle seven million gallon centrifugal hydraulic pump in the New York navy yard collapsed, with a crack 20 ft. long and it was ascertained from the makers of the pump that it would take 26 weeks to procure duplicate cast- ings to replace the broken parts, it was suggested by the engineer in charge who had used smooth-on cement successfully, that he believed he could repair it with this cement and permission was given. It was repaired successfully in three days and worked during the past six years. This makeshift saved thousands of dollars and made a reputation for engineer in charge that subsequently put him in charge of one of the largest manufactur- ing plants in this country with a corre- sponding increase in salary. This use paid owner and employe and was a per- manent repair. There were two such repairs made in the New York navy yard. We could recite a hundred other in- stances where important repairs have been successfully made to pumps. One particularly difficult boiler patch on the circumferential seam of a ma- rine boiler patch was 7 ft. long and Io in. wide. It had been put on in the usual way with white and red lead and iron fil- ad- not 'cylinder 3-16 inches wide, THE MARINE REVIEW ings without success. We suggested that it could be repaired with smooth-on ce- ment, and we received the following re- port from the engineer in charge, Mr. Moody, of the Delaware Be ala Ship- building & Engine Co.: Roach's Shipyard. The Delaware River Iron Ship Building and Engine Works. Chester, Pa. Nov. 25, 1905. Smooth-On Mfg. Co., Jersey City, a ae My Dear: Sirs: I think we had better keep pounds of smooth-on. The little boat left yesterday and is on her route, the boiler has had steam up for several days and the patch put on with your smooth-on works fine so far; not a sign of a leak anywhere. So far so good. Yours truly, THos. Mooney. the > 60 A Corliss engine cylinder in a large cement works at Bath, Pa., was scored by a broken steel spring ring inside the cutting a groove in the Y4-inch deep cylinder 24 x 42, and 42 inches long. The repair was made as follows: The piston was removed and the groove dove- tailed, then it was thoroughly cleaned and dried, and filled with a compound composed of one volume of smooth-on elastic cement, mixed with one volume of smooth-on iron cement No. 1, which makes a stiff putty. This putty was packed into the groove, with a blunt tool, as compactiy as possible, until the groove was filled, then it was smoothed even with the curved surface of the cyl- inder. The exhaust pipe was now closed and steam turned into the cylinder with IIo pounds pressure and held there from 4 p. m. until the next morning at 7 a. m. when the cylinder head was taken off and the cylinder left open to the air for .24 hours. Then -the engine was made ready and started up. It has now been running night: and day for four months, giving perfect satisfaction. Steam pressure 160 pounds. The above report was made to us by the engineer who did the work. The steamship Cusco, running from Valparaiso to New York, had boilers. out of commission trom leaks in seams and around rivets. This was an inside job and in 24 hours the boilers were repaired and used with 240 pounds steam pres- sure and they were tight. This is one of many such cases. The chief engineer was so pleased with the use of our ce- ment that he came to our office to tell us about it and to see all the cements we make and learn more about their uses. A cross compound high pressure cylin- der at the 66th street power house of the Edison Electric Light & Power Co., was repaired with smooth-on elastic ce- ment and smooth-on iron cement No. 1-- Diameter of cylinder .. 48 inches, F to G. Length of Crack'... .. = 16 inches, D to E. Length: of patel... ~ 36 inches, H to I. Boiler 'pressure = .45 0.20. 4.2: 150 pounds Borer oateh. ...,"55 . ¥Z-inch steel plate Bolteesigi: 5g inch on edge of patch Bolts .... 34 inch in the center of patch. The repair was made as follows: 1. While the cylinder was hot a par- tial vacuum was created in it and smooth- on elastic cement was painted over the crack, The vacuum drew the cement in and this operation was continued until the crack would take up no more ce- ment. 2. Holes were then drilled and tapped at the end of the crack; D and E. and bolts put in to prevent a further exten- sion of the crack. 3. The patch was cut as represented. 4. The crack was then painted with smooth-on and the patch laid in position. Then it was carefully removed. The imprint of the crack was now shown on the under side of the patch--the smooth- on sticking to it. The patch was then dished along the line of the imprint to make a recess *o hold sufficient cement. 5. The plate was then :warmed and a compound composed of smooth-on iron cement No. I and smooth-on elastic cement,.mixed half and half applied to the warm plate with a small trowel, mak- ing a thin, even coating. | 6. Then the satch was lad in position. The three centre bolts, A, B and C, near- est the crack were brought uo '(just taut). Then the outside bolts were brought up tight, and lastly, the three centre bolts were brought up as tight as possible, which forced the cement into the crack. Then steam was turned on and the crack was tight. In these cements there appears a com- pensation that seems to adapt it to condi- tions caused by sudden strains and vi- brations; for instance, 2 patch on a steam cylinder of a locomotive, capable of pulling 60 or 70 loaded cars, one of their machines: '.ad cracks on the steam way from the piston valve chamber to the steam cylinder on each side of the arch. The cracks had been repaired by patching the old way with white and red lead and iron borings without success. The cracks were then filled with smooth- on cements and are in use now on 200 pounds steam »vressure. There are hundreds of such cases and I believe most of them can be successful- ly repaired. Don't make your patch plate too thick, fit the edge of plate tight to surface, use plenty of small bolts. on 'edges and a few staggered bolts on each side of middle to force cement cracks and you will have success. into