. Science of railways . e, a sound tube will never beinjured when directions for operating are followed. If the Dean were operating in the center of an 18-foottube, the vibration at 8 inches inside the header would be soslight that it could hardly be detected even with the mostsensitive instruments. 324 . LOCOMOTIVE APPLIANCES. The Dean Is claimed also to be effective for boiler inspect-ing and locating boiler weaknesses before they get far enoughto cause trouble. Scale has a natural affinity for cracks, crevices, and joints;there it collects in patches and layer upon layer, acting as acement


. Science of railways . e, a sound tube will never beinjured when directions for operating are followed. If the Dean were operating in the center of an 18-foottube, the vibration at 8 inches inside the header would be soslight that it could hardly be detected even with the mostsensitive instruments. 324 . LOCOMOTIVE APPLIANCES. The Dean Is claimed also to be effective for boiler inspect-ing and locating boiler weaknesses before they get far enoughto cause trouble. Scale has a natural affinity for cracks, crevices, and joints;there it collects in patches and layer upon layer, acting as acement of the most deceptive kind. Particularly where thetube and header join, scale collects and causes the joint toloosen either through corrosion or by preventing expansion,and the regular use of the Dean will disclose a loose or weak-ened tube as soon as it starts to vibrate, and, also, the scalewill be removed. By simply changing the vibrator head it may be changedfrom a water-tube cleaner to a fire-tube cleaner. By being. Fig. 4The Dean Removing Scale from the Tube of a Return Tubular Boiler a soot cleaner as well as a scale remover, in an arch tube itremoves soot and clinker from the outside and scale from theinside in the same operation. CYCLONE ARCH TUBE CLEANERSThe Cyclone arch tube cleaner is a tool for cleaninglocomotive arch tubes. It is powerful and efficient, and madein sizes to meet all requirements. It should be operated byair whenever possible, although very satisfactory resultshave been obtained with steam. Air is preferable, as the hightemperature of steam is liable to expand and loosen the it is necessary to use steam, a small stream of coldwater, supplied from a %-inch garden hose and flowing intothe tube being cleaned, will prevent all damage from motor of this machine is very compactly built. It LOCOMOTIVE APPLIANCES. 325 consists of an outer casing, in which is enclosed a removablehardened steel cylinder, in which revolves an eccentrically-m


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