. Science of railways . IIIIIIIIIIIIIIIH^ Fig. Car or Tender Brake Shoe. back that if the shoe from any causeshould crack or break, in several pieces,it can still be worn out with entire 10 shows a malleable metal orsteel back extending over the lug onback of shoe, and through whichpasses the key that secures the shoeto brakehead. This lug, when formedof the cast metal integral with the bodyof the shoe, is liable to break, in whichcase the shoe is at once detached frombrake head and falls off; but with themalleable metal back extending over. Lappin Brake Shoe. 178


. Science of railways . IIIIIIIIIIIIIIIH^ Fig. Car or Tender Brake Shoe. back that if the shoe from any causeshould crack or break, in several pieces,it can still be worn out with entire 10 shows a malleable metal orsteel back extending over the lug onback of shoe, and through whichpasses the key that secures the shoeto brakehead. This lug, when formedof the cast metal integral with the bodyof the shoe, is liable to break, in whichcase the shoe is at once detached frombrake head and falls off; but with themalleable metal back extending over. Lappin Brake Shoe. 178 LOCOMOTIVE APPLIANCES. and forming the lug, it is impossible for the shoe tobreak at this point and fall off. Fig. 11 shows the backhand face view of the inter-locking shoe, the latest development in brake shoeimprovements, which it is claimed will entirelyeliminate the brake shoe from the scrap heap,as this shoe wears entirely out in the service,leaving no scrap that can be found. It can befurnished in the ordinary soft iron brake shoemixture, to roads that so prefer it, or it can be fur-nished with inserts in the face for use on chilledwheels, or it can be chilled in sections in conformitywith the Lappin standardsfor use on either chilled orsteel tired wheels, the insertsof the chills very greatlyincreasing the life or wearingqualities^ of the shoe. When first applying thistype of shoe, what isknown as the plain-facedtype without any inter-locking recesses cored in the face is used, andwhen this shoe has worn down to about five-eighths of an inch in th


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