. American engineer and railroad journal . eeds) and prescribe arange of performance for different pressures within which themean coefficient of friction of all shoes must come. In order further to insure a sufficient degree of uniformityin the friction of each shoe during the length of the applica-tion, it should be specified that the coefficient of friction at acertain number of feet, after the application commenced, shouldnot be less than such a per cent, of the mean coefficient of fric-tion, and that the coefficient of friction a certain number offeet from the stop should not be more than
. American engineer and railroad journal . eeds) and prescribe arange of performance for different pressures within which themean coefficient of friction of all shoes must come. In order further to insure a sufficient degree of uniformityin the friction of each shoe during the length of the applica-tion, it should be specified that the coefficient of friction at acertain number of feet, after the application commenced, shouldnot be less than such a per cent, of the mean coefficient of fric-tion, and that the coefficient of friction a certain number offeet from the stop should not be more than a certain per cent,above the mean coefficient of friction, and should be less thana certain fixed limit. This arrangement would provide an ele-ment of elasticity which would cover the unavoidable varia-tions in the results of tests, and at the same time would securea degree of uniformity which would, in great measure, remedyexisting evils. 1-8- -• .=f-^ 4( j.^- -9-^- -,■--- - \ V , / S12 AMERICAN ENGINEER AND RAILROAD Wide Fireboxes and Large Driving New Design for Passenger Service-Lehigli Valley Railroad. WIDE FIREBOXES AND LARGE DRIVING WHEELS. on The tendency toward the use of wide fireboxes for bituminouscoal-burning engines is becoming pronounced, and many indi-cations point to a general adoption of this practice. It is ratherradical, but we have not yet heard a single unfavorable criti-cism of either the Prairie or Northwestern types as faras the size of the firebox is concerned, and we know of threeentirely different designs of wide firebox engines for soft coalwhich are likely to appear during the approaching winter. Webelieve this to be a very important step in locomotive design,and it should be studied most carefully. Much has beensaid about having nearly approached the limits of weight andpower (particularly of fast passenger engines), but it seemsprobable that the use of larger grate areas places the timefor reaching the limits furth
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