. Science of railways . ^^^H. Plate 4Spark Catcher on Roof of Testing Plant then changed to one minute after the stop. The results werefound in percentages; for example, 20 per cent smoke beingNo. 1 on the Ringelmann scale. The amount of air entering the fire box through the ashpan, fire door and steam-jet tubes was determined by the useof anemometers, as shown in Plate 3. The velocity of the air entering the ash pan was deter-mined, only while running, by the use of an anemometer fittedinto a funnel. The funnel was placed in six different positions LOCOMOTIVE APPLIANCES. 647 Ground the pan an
. Science of railways . ^^^H. Plate 4Spark Catcher on Roof of Testing Plant then changed to one minute after the stop. The results werefound in percentages; for example, 20 per cent smoke beingNo. 1 on the Ringelmann scale. The amount of air entering the fire box through the ashpan, fire door and steam-jet tubes was determined by the useof anemometers, as shown in Plate 3. The velocity of the air entering the ash pan was deter-mined, only while running, by the use of an anemometer fittedinto a funnel. The funnel was placed in six different positions LOCOMOTIVE APPLIANCES. 647 Ground the pan and readings taken for one minute. Theaverage velocity thus determined was used to complete thevolume of air entering the ash pan. The velocity of air through the fire-door openings wasdetermined, only while the locomotive was standing, in asimilar manner, except that the funnel was tight-fitting aroundthe damper slide. The volume of air injected by the steam-jet tubes, bothwhen running and when standing, was determined from a
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