. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . is friction-reducing or lubricatingeffect of the heated she will stronglydemonstrate itself to any mechanic whowill carry out the following simple experi-ment : Improvise a brake shoe, lever andfulcrum and apply the apparatus to effec-tively brake one of the two flywheels of a10 horse-power or smaller gas or gasolineengine by applying the shoe to the bottomside of the wheel and prying over thefulcrum, placed conveniently near, withihe lever, preferably an 8-foot length of2 X 4-inch timber. Wh
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . is friction-reducing or lubricatingeffect of the heated she will stronglydemonstrate itself to any mechanic whowill carry out the following simple experi-ment : Improvise a brake shoe, lever andfulcrum and apply the apparatus to effec-tively brake one of the two flywheels of a10 horse-power or smaller gas or gasolineengine by applying the shoe to the bottomside of the wheel and prying over thefulcrum, placed conveniently near, withihe lever, preferably an 8-foot length of2 X 4-inch timber. While an assistantholds the lever at brakes off run theengine at full speed, then quickly breakthe spark circuit or throw the valve gearout so that the engine will run idle; thengo to the lever and weight it down to apredetermined pressure, say that of yourown weight, and note carefully the lengthof time required for the engine to come toa dead stop. Now exactly repeat the ex-periment, but with first heating the shoem a fire to a dull red heat, and note thegreater length of time required to stop the. BORTNG BAR FOR pJ^-lNCH AIR PUMP. owing to the fact that the shoe face be-comes exceedingly hot, it offers a muchweaker resistance to the sliding wheelface than it would if it remained cold. Thepart played by the momentum of the carin decreasing the coefficient of resistanceis simply that, by its forcing the wheel to the engine with the same weight uponlever. A plausible explanation of what mightconsiderably lessen the retarding force ofthe shoe is that the sparks flying fromthe edge of the shoe indicate but a smallfraction of the amount of volatilization February. 1901. LOCOMOTIVE ENGINEERING 83 which actually takes place between thebhoe and wheel, by reason of sufficient airbeing carried to them by the rapidly pass-ing rough face of the wheel, and themyriads of particles which loosen andvolatilize before they have time to passout from under the shoe tend to cushionIts bearing again
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
