. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . re maintained duringthe different tests. There \yas very littledifference in this respect between the twolocomotives, as both were free steamers;but it was noticeable that the boiler ofengine 7615 was more rcsjionsive to thedemands made upon it tlian ihal of engine7142. During the course of the tests some 475 An elevation and cross-section of thefirebox of engine 7615 is shown in Fig. two test fireboxes are of the ^amedimensions throughout, the only differ-ences being those noted above.
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . re maintained duringthe different tests. There \yas very littledifference in this respect between the twolocomotives, as both were free steamers;but it was noticeable that the boiler ofengine 7615 was more rcsjionsive to thedemands made upon it tlian ihal of engine7142. During the course of the tests some 475 An elevation and cross-section of thefirebox of engine 7615 is shown in Fig. two test fireboxes are of the ^amedimensions throughout, the only differ-ences being those noted above. The tests were run between Milwaukeeand Portage. In the following tables theletter W following the test number in-dicates that the run was west-bound, fromMilwaukee to Portage, while the letterE indicates that the tests were east-bound. No attempts were made to control themake-up of the lest trains other thanlimiting the tonnage to what the enginescould handle over the ruling No. 1 shows the coal consumption,column three showing the total pounds ofcoal fired while train was in lie. VIKW OK IIOILEK WITH NICHOLSON TIIEKMIC SYPHON. 8 AND LOCOMOTIVE ENGINEERING. January. 1919 readings were taken of the boiler pressureof engine 7615, and of these only 19showed a pressure below 195 pounds, thepop valves being set at 204 pounds. Full sMam pressure could be maintainedwithout trouble against both injectors when engine 7615 was working its hardeston grades. Table No. 4 shows the equivalent evap-oration, boiler horse power and efficiency,the boiler efficiency being based on theheat in the coal as fired. TABLE NO. 2. to.\L .Analysis—Coal as 4 .^ 6 Eng. Test \olalilc 1 ixfd Per No. No. Moisture Combustible Carbon Ash Sulphur Lb. Coal ri-E 4233 11789 2-\V 9671 3-W 9799 4-E 9622 Ave. 10184 fl-VV 10
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