. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . efficiency factor (ef> is the com-bined product of the brake rigging effi-ciency (e) for transmitting and multiply-ing the cylinder force into normal brakeshoe pressure, and the coefficient of brakeshoe friction if) which is the measure oftangential force acting on each wheel inrelating to the,normal brake shoe pres-sure. It is not possible, nor is it neces-sary, to separate these two factors for thepurposes of computation. The combinedproduct is the connecting link betweenthe actual avera
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . efficiency factor (ef> is the com-bined product of the brake rigging effi-ciency (e) for transmitting and multiply-ing the cylinder force into normal brakeshoe pressure, and the coefficient of brakeshoe friction if) which is the measure oftangential force acting on each wheel inrelating to the,normal brake shoe pres-sure. It is not possible, nor is it neces-sary, to separate these two factors for thepurposes of computation. The combinedproduct is the connecting link betweenthe actual average retarding force whichmust have been acting to effect a givenstop distance obtained in actual serviceand the nominal brake shoe pressure de-termined by multiplying the brake cylin-der pressure by the brake piston area,and the leverage ratio of the brake rig-ging. Holding Device for Lifting Air Pumps. llv F. W. Bentlev, Missouri Nallcy, Iowa. A large number of local devices are inuse for holding a 9^-in. air pump whilelifting it to place on the locomotive, orlowering it as the case may be. In the. use of chains, no matter how securelyslung they may be around the pump, theyhave frequently been known to slip andcause troulile, while gral) books and irons,that were designed for the purpose, havealso failed at the critical moment. The accompanying sketch shows a verysimple plate, or what may be called at!irce-piece arrangement, which thoughperhaps requiring a little longer time inattaching, is a thoroughly safe and prac-tical contrivance for the purpose. Thefour upper main tap bolts are removedand th^ respective plates applied. Fourtap bolts are used for securing the plates,and when not in use the bolts are held onthe plates by f^-in. nuts. It will beobserved that it is necessary that the lefthand plate be cut with a larger radius atthe bottom to accommodate the left valvecylinder cap. On a long, higli lift, running boardcranes and pulley blocks need all the at-tention that is pos
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
