. Science of railways . advantage gained by this combination is thatthe long life of the chilled iron is obtained, while atthe same time the soft iron gives to the shoe fric-tional qualities equal to those of the ordinary cast LOCOMOTIVE APPLIANCES. igi iron so commonly used in service. The wearingqualities of this combination of materials have re-peatedly been showii by service tests made on manyrailroads, while recent laboratory tests have estab-lished the claims made for the frictional quahties ofthese shoes. It is claimed that one of these shoessuch as shown in Fig. 15, will outwe
. Science of railways . advantage gained by this combination is thatthe long life of the chilled iron is obtained, while atthe same time the soft iron gives to the shoe fric-tional qualities equal to those of the ordinary cast LOCOMOTIVE APPLIANCES. igi iron so commonly used in service. The wearingqualities of this combination of materials have re-peatedly been showii by service tests made on manyrailroads, while recent laboratory tests have estab-lished the claims made for the frictional quahties ofthese shoes. It is claimed that one of these shoessuch as shown in Fig. 15, will outwear six plai^cast iron shoes of ordinary hardness. THE WHEEL TRUING BRAKE SHOE Wheel Truing brake shoes are in reality wheel grinders,made in the form of brake shoes, and used as such whiledoing the work of truing up car wheels and locomotive driverwheels. They are interchangeable with the regular brake shoes. When a wheel needs grinding it is simply necessary toremove the regular brake shoes, apply the truing shoes, run. the car or engine as usual, and when the wheels are foundto be in good shape, the truing shoes are removed and heldin reserve for another occasion. The truing shoes are made to fit any brake head, anysized wheel, and the abrasive material is put in the shoesto correspond to that part of the wheel which needs grinding,and where grinding is not required, the material in the shoesis non-abrasive. 182 FLEXIBLE METALLIC JOINTS. It has long been customary to convey steam andair by rubber hose when flexibihty of construction hasbeen required. In regard thereto it should also bestated that such hose has been perfected in qualityto a very great extent. However, the combinedeffects of the pressure within and the weather withoutultimately require its renewal, and the length of timeduring which it may safely be used is very indeter-minate. With the advent of the air brake on all classes oftrains, and steam heating on passenger trains, camea demand for some flexible metalli
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