. Science of railways . Pig. Cup. the bearing with lubricant while in motion, to feedlittle or no oil when standing still, and to feed copi-ously when the bearing gets hot.* There are so many *The subject of lubrication and lubricants is referred to inanother volume of The Science of Railways.* 497 498 LOCOMOTIVE APPLIANCES. different kinds of oil cups in use, many of tliem pat-ented, that it would be impossible to describe themall. The following examples will, however, serve ina general way to indicate the various types and theuses to which they are put:.

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