. Locomotive engineering : a practical journal of railway motive power and rolling stock . elength of the frame by means of aI >4-inch seven-thread screw, which has apulle\- at one end belting from a counter-shaft, this screw working in a nut formedin the lower part of the head which istapped to receive it. The head is madeof Yz by 3-inch iron, and carries threehardened steel rollers 2x2 inches havingserrated peripheries, and which revolvefreely on J^-inch pins. Fig. 2 shows thearrangement of the rollers in the travelinghead, and the method of securing theflue in place to be operated on. It
. Locomotive engineering : a practical journal of railway motive power and rolling stock . elength of the frame by means of aI >4-inch seven-thread screw, which has apulle\- at one end belting from a counter-shaft, this screw working in a nut formedin the lower part of the head which istapped to receive it. The head is madeof Yz by 3-inch iron, and carries threehardened steel rollers 2x2 inches havingserrated peripheries, and which revolvefreely on J^-inch pins. Fig. 2 shows thearrangement of the rollers in the travelinghead, and the method of securing theflue in place to be operated on. It is seenthat the head is made to .spring such anamount that, when bolted on one sideonly, the cutting rollers will be at a properdistance from the flue to clean it to themetal, and this amount of spring is adjustedby the bolt very nicely. At the left-hand end of the frame. Fig. i,are secured two bearings, in which worksthe driving mechanism ; this consists of ashaft, on which is the driving ])ulley, actu-ated from the line shaft, and a uni-versal chuck which grips and carries the. Roller eor Flue Cle.^ner. appear ridiculous in comparison, and is anobject lesson in attaining an end when amechanic is on the trail. g i i Tinning Pistons. When a certain kind of material givesgood results in one kind of service, thereis a great inclination with the ordinaryman to believe that it is good for uni-versal use. Bad mistakes are frequentlymade by this free generalization. Forexample, the finest working locomotivecrossheads we have ever seen had tinnedsurfaces bearing on the guides. Thenatural inference is that tin will make thebest kind of wearing surface for any parthaving a reciprocatory motion. There were some rather edifying factsbrought out in a discussion in the MasterMechanics Convention about the use oftin in pistons. In crossheads it had beenan unqualified success, and a committeereported that where steel pistons were usedit was customary to heavily tin the outerrinL where
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroa, bookyear1892
