A. Yes; to allow any accumulation of gas to escape and to admit the air
so that oil will flow freely.
43. Q. Do you inspect your oil pipes and report all leaks? What other
bad effect has a pipe leak aside from waste of oil?
A. Yes. It will cause oil to feed irregularly.
44. Q. Are you aware that keeping the flues clean is the greatest one
thing that you can do in regard to fuel economy, and how often should
they be cleaned?
A. Yes. At least every ten miles.
45. Q. Do you know that the engine should be working hard and at a speed
not less than twenty miles per hour when sanding flues to avoid the sand
falling to floor of the fire-box and accumulating in front of them?
A. Yes.
46. Q. Do you realize that on first closing throttle you should not
adjust fire too low? Explain best method.
A. Yes. I would allow steam pressure to fall back some fifteen pounds
before throttle is closed and on having closed same leave a good fire in
box, allowing it to cool gradually to avoid leaky flues, broken
staybolts, cracked sheets caused by sudden fall of temperature.