. Science of railways . Fig. 13. Fig. 14. Fig. 15. Corning Soft Gray Iron Insert. Corning Driver,Brake Shoe. Corning PlainBrake Shoe. soft gray iron core, shown in Fig. 13; the body ofthe shoe has a chilled face. The sides of the softiron inset are so tapered from the back to the faceof the shoe that, after the body is cast about it, asection through the shoe shows a dove-tail 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 LOCOMOT
. Science of railways . Fig. 13. Fig. 14. Fig. 15. Corning Soft Gray Iron Insert. Corning Driver,Brake Shoe. Corning PlainBrake Shoe. soft gray iron core, shown in Fig. 13; the body ofthe shoe has a chilled face. The sides of the softiron inset are so tapered from the back to the faceof the shoe that, after the body is cast about it, asection through the shoe shows a dove-tail 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
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