23. =_Don’t_= fail to keep an eye out for leaks and have them
repaired immediately, no matter how small.
24. =_Don’t_= fail to empty the boiler every week or two and re-fill
it with fresh water.
25. =_Don’t_= let any air into the furnace, except what goes through
the grate-bars, or the smoke burners, so called, by which the air is
highly heated.
26. =_Don’t_= increase the load on the safety-valve beyond the
pressure allowed by the inspector.
27. =_Don’t_= fail to open the doors of the furnace and start the
pump when the pressure is increased beyond the amount allowed, _but_
28. =_Don’t_= fail to draw the fires _when there is danger_ from the
water having fallen too low.
29. =_Don’t_= fail to check the fire—if too hot to draw, do it with
fresh coal, damp ashes, clinkers or soil; _and_
30. =_Don’t_= fail to open the doors of the furnace and close the
ash-pit doors at the time the fire is checked—_and_
31. =_Don’t_= decrease the steam pressure by feeding in water or
suddenly blowing off steam, _and_
32. =_Don’t_= touch the safety-valve, even if it be opened or closed,
_and_
33. =_Don’t_= change the feed apparatus if it is working, or the
throttle-valve be open; let them both remain as they are for a short
time, _and_
34. =_Don’t_= fail to change them very cautiously and slowly when you
close them, and
35. =_Don’t_= fail to be very cool and brave while resolute in
observing these last seven “Don’ts.”