oken?

A. If they were stopped up the equalization would be destroyed, and when
the steam-chest pressure was less than the boiler pressure the feed
would work too fast, the oil would enter the feed glass in a stream
instead of forming into drops. If they were broken, the lubricator could
not be used. The auxiliary oilers would have to be used to lubricate the
cylinders.

=AIR BRAKE QUESTIONS=

1. Q. Explain how an air compressor should be started.

A. A compressor should be started slowly, with the drain cocks open to
allow the water of condensation to escape; and as no provision is made
in the steam end to cushion the pistons at the end of their stroke, it
should be allowed to work slowly until a pressure of thirty or forty
pounds has accumulated in the main reservoir; the piston, having to work
against this pressure, will be cushioned at the end of each stroke.
After the compressor is warm, the drain cocks should be closed and the
throttle opened sufficiently to run the compressor at the proper speed.
The lubricator should then be started and allowed to feed freely until
eight or ten drops have passed, when the feed should be reduced to an
amount sufficient for proper lubrication.

2. Q. What kind of oil should be used to lubricate both the steam and
air cylinders of the compressor?

A. Valve oil.

3. Q. Where does the main reservoir pressure begin and end?

A. Begins at the discharge valves in the compressor and ends at the
engineer's brake valve.

4. Q. Where does the brake pipe pressure begin and end?

A. The brake pipe pressure begins at the feed valve and ends at the
brake pipe side of the triple piston, conductor's valve and at the rear
angle cock.

5. Q. What is meant by excess pressure, and where is this pressure
carried?

A. Excess pressure is carried in the main reservoir and is the pressure
above that in the brake pipe.

6. Q. Why is excess pressure necessary?

A. To insure the prompt release of all brakes and quick recharge of the
brake pipe and auxiliary reservoirs.

7. Q. How is the amount of excess pressure regulated?

A. By the compressor governor.

8. Q. Name the different parts of the air brake as applied to a car.

A. The triple valve, auxiliary reservoir, brake cylinder, brake pipe,
angle cocks, cut-out cock, retaining valve, centrifugal dirt collector
and strainer tee.

9. Q. What is the duty of the triple valve?

A. The triple valve has three duties to perform