. The Locomotive . nges inthe draft gage reading mean changes in the amount of air comingthrough the fire. If we get a hole in the fire, the draft gage read-ing falls suddenly because the resistance of the fire-bed to thepassage of the air has become much less. If the fire clinkers upand gets dirty, the draft gage reading will increase because theresistance is greater, and neither of these readings will mean any-thing as to how much air is getting into the furnace, while the holeis there, or while the fire is dirty. On the other hand, with a cleaneven fire, if we open the damper a bit, the dra
. The Locomotive . nges inthe draft gage reading mean changes in the amount of air comingthrough the fire. If we get a hole in the fire, the draft gage read-ing falls suddenly because the resistance of the fire-bed to thepassage of the air has become much less. If the fire clinkers upand gets dirty, the draft gage reading will increase because theresistance is greater, and neither of these readings will mean any-thing as to how much air is getting into the furnace, while the holeis there, or while the fire is dirty. On the other hand, with a cleaneven fire, if we open the damper a bit, the draft gage reading in-creases because more air is flowing and the amount of increasetells us about how much more air is flowing. If the damper isclosed a bit, less air flows and the reading of the gage falls thing which the draft gage can show is at once apparentwhen the following simple test is made. Have the fire clean andeven, free from holes. Do not open the furnace doors or close igiQ-l THE LOCOMOTIVE 147. -purnoceJDraft JDraft Through
Size: 1357px × 1840px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauth, bookcentury1800, bookdecade1860, bookidlocomotive32hart
