elieve gave very favour - able results . Of course it is essential that the bottom of the com - bustion chamber should be perfectly air tight , means being adopted for regulating the supply of air into the chamber up the vertical tubes . Various other arrangements were tried on different railways ,… … forms , stopping up the space between the fire and balaace weighL D > Damper . bars , and consequently burns them . very soon . In some arrangements of step grates a movable grate is placed at the foot of the stepped bars , which can be readily opened for the removal of clinker and ashes . Another…
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