zing tubes balances the pressure which comes from the steam
chest when the engine is working steam.

20. Q. How should the lubricator be filled?

A. First close all valves connected with the lubricator, open drain plug
and remove filling plug, allowing water to escape until oil appears
with it. Drain plug should then be closed. Fill the oil tank in the
usual way, being careful not to overflow it; then replace filling plug.
If the supply of oil is insufficient to fill the lubricator, water can
be used to finish it, as the lubricator will begin feeding sooner when
filled full.

21. Q. After filling lubricator, what should be done?

A. Open the steam throttle to the lubricator wide, then carefully open
the water valve, but do not open the feeds until sure the chamber in the
glass is filled with water.

22. Q. How long before leaving terminal should the feed valves be
opened? Why?

A. About fifteen minutes; this time is necessary to allow oil to feed
through the oil pipe and reach the steam chests.

23. Q. How many drops should be fed per minute?

A. From one to seven, timed by the watch, depending on conditions.
Cylinders of large size require more oil than smaller ones.

24. Q. If lubricator feeds regularly when working steam and too rapidly
after shutting off, what is the trouble?

A. The opening in the choke plug at the lubricator or through the steam
valves at the steam chest is too large and should be reduced to the
proper size by applying new chokes or valves.

25. Q. When valves appear dry while using steam and the lubricator is
working all right, what would you do to relieve these conditions?

A. Ease off throttle for a few seconds to reduce the steam chest
pressure and drop the reverse lever a few notches to give the valve a
longer travel; oil held in the pipes will then flow down.

=FEDERAL REGULATIONS=

=For Inspection of Locomotive Boilers and Safety Appliances=

1. Q. What is the purpose of the federal rules and regulations for
inspection of locomotive boilers?

A. So that all railroads operating under the laws of the United States
government, would be obliged to maintain their boilers in a safe working
condition.

2. Q. What is the purpose of the quarterly and monthly interstate
inspection cards placed in the cab of the locomotive?

A. So that the federal inspector or engineer may see that the locomotive
boiler has received its monthly or quarterly inspection.

3. Q. What const