. Railway master mechanic [microform] . ube from the canvaswrapping. A little experience, however, aided by a fewdrops at a time of naptha. will enable the separation ofrubber tube, rubber cover, and even the friction skimmingcoat, all cf which are then tested in the stretching te-machine shown in Fig. 2. The method of testing the stripsof rubber is clearly detailed in the specifications. If the• hose successfully passes the friction and stretchingsts, all of the hose in the shipment are examined to notetheir compliance with the balance of the requirements. The two testing machines il-lustrate
. Railway master mechanic [microform] . ube from the canvaswrapping. A little experience, however, aided by a fewdrops at a time of naptha. will enable the separation ofrubber tube, rubber cover, and even the friction skimmingcoat, all cf which are then tested in the stretching te-machine shown in Fig. 2. The method of testing the stripsof rubber is clearly detailed in the specifications. If the• hose successfully passes the friction and stretchingsts, all of the hose in the shipment are examined to notetheir compliance with the balance of the requirements. The two testing machines il-lustrated are subject to slightvariations in construction, buthave proven amply accurateand convenient for the scrap pile is always agood and fruitful field for ob-servation as to causes ofweakness or removal of defec-tive parts of equipment. Fromthe hose scrap pile we findprominent among the causesof disability among hose: 1st. Kinked, with rubber ofcover badly cracked at kink,exposing canvas to the weath-er and causing leakage. In. Fig. 3—uacbixe fob testing eubbeb hose by , or by cutting of tube by roughness of the the hose seems porous all over. In every caseof a porous or leaky hose, the tube is cut or cracked fromthis or some other reason. In some cases I have found thetube made of rubber that seemed to have lost its life, andwas brittle and full of cracks; in others, especially thosehaving machine-made tubes, or one calender handmadetube, there have seemed to be one or more small the tube, where, either from grains of dirt or gritdropping out, or some other cause, the tube was punc-tured from the inside. 3d. Chafed or cut by chafing. This is a quite commoncause of hose removal. It comes from being hit or robbed,generally at the nipple-fitting end. thereby brnising or cut-ting the cover, sometimes into the first or second ply ■ fcanvas. This is, as a rule, a defect of less danger thanhas commonly been supposed, unless the
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1895
