. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . or sites, but will inmany cases permit of a saving due to aless expensive trackage layout. The question of the economy of instal-lation in existing elevators is one whichwould have to be studied for each separatecase by expert elevator engineers. Thewriter believes, however, that where alarge volume of grain is handled that astudy of the question would be well worthwhile and that unloaders can be installedto advantage in most existing elevatorswithout making anv essential changes. Some Qualit
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . or sites, but will inmany cases permit of a saving due to aless expensive trackage layout. The question of the economy of instal-lation in existing elevators is one whichwould have to be studied for each separatecase by expert elevator engineers. Thewriter believes, however, that where alarge volume of grain is handled that astudy of the question would be well worthwhile and that unloaders can be installedto advantage in most existing elevatorswithout making anv essential changes. Some Qualities of Bearing Metals The A. W. Cadman Manufacturing Pittsburgh, Pa., have recently issuedtwo very interesting pamphlets on the sub-ject of white bearing metals. They dealwith the general structural details of theordinary babbitt metals and .show how Of course it is well known that any-thing would do for a bearing metal if thefilm of the lubricant could always maintainthe separation between the bearing and theshaft. So long as these two do not touch,all will be well. But when the oil film is. FIG. 1. GENUINE BABBITT. \LYSIS IDENTICAL WITH FIG. 2. TIN , ANTIMONY , COPPER that structure has an important influenceon their friction-reducing qualities. In the matter of the preparation of abearing one point is brought out uponwhich too much emphasis cannot beplaced, and one to which it may be saidthat no attention at all is paid. That isthe temperature at which the metal shallbe poured. Every iron founder in thecountry and every steel maker knows thatunless he pours his metal at a proper tem-perature, the resulting castings or ingotswill be defective. Yet it is safe to saythat tliere is hardly a railroad company inthe country, if indeed there is one, wherea thermometer or pyrometer is used todetermine the temperature at which bear-ings are poured. Yet, as one of thepamphlets states: It is as wise to expectgood bread from a cold or overheatedoven as good bearings
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