. American engineer and railroad journal . o compel much greater extension. The remarkably satisfactory results with the sand blast incleaning the old i)aint from the 155th St. Viaduct, New York,preparatory to painting the girders for the tests described inour August. 1898, issue, page 259, have done a great deal toshow its value. The surfaces were required to be perfectlyclean, which could not be accomplished by wire brushes orscrapers. At that time the engineer in charge, Mr. E. P. North,consulted 20 prominent engineers as to the advisability of usingthe sand blast for this purpose and the r
. American engineer and railroad journal . o compel much greater extension. The remarkably satisfactory results with the sand blast incleaning the old i)aint from the 155th St. Viaduct, New York,preparatory to painting the girders for the tests described inour August. 1898, issue, page 259, have done a great deal toshow its value. The surfaces were required to be perfectlyclean, which could not be accomplished by wire brushes orscrapers. At that time the engineer in charge, Mr. E. P. North,consulted 20 prominent engineers as to the advisability of usingthe sand blast for this purpose and the replies all stated thatno better method of removing scale, rust and old paint fromall parts of an iron or steel structure was known. This cor-respondence clearly brought out the importance of absolutelyclean metallic surfaces for the reception of paint. The sandblast will reach all parts of a structure which are inaccessibleto a brush and scraper, and it will do the work cheaper thanany other method. This was proven some time ago by Mr. Fig. 1.—King Sand Blast Mactiine. K. Smith, assistant engineer in charge of bridges of the Cityof Baltimore, in the case of the bridge over the PennsylvaniaRailroad at Argyle Ave. The bridge had not been paintedfor 20 years, and the rust and scale were over % inch thick,the pitting was 1/16 inch deep. Hand cleaning, which wasnot effective or satisfactory, cost 5 cents per square foot, andon trying the sand blast the work was done both better andcheaper. Bridge work is a large field for this process, and in factany work requiring the removal of paint or scale from metallicsurfaces, for subsequent painting, plating or enameling. It isspecially successful in cleaning castings as they come fromthe molds. It will remove sand that is burned in, and at oneoperation it will prepare a rough sandy casting for nickelplating. I^ocomotive tenders are cleaned from old paint, carwheels are cleaned at the foundry, old files smoothed off forrecutting; paint
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
