the tank that has the syphon connections instead of
the old-style tank valves?

A. Open the pet cock at the top of the syphon before taking the hose
down.

59. Q. Is any more water used when the engine foams than when the water
is solid?

A. Yes, very much more.

60. Q. How would you prevent injector feed pipes or tank hose from
freezing in winter when not in use?

A. The steam valve should be slightly open to permit a slight
circulation of steam through the feed and branch pipes. The heater cock
should be closed and the drip cock under the boiler check or on the
branch pipe should be opened to insure a circulation of steam through
the branch pipe.

61. Q. How would you prevent the overflow pipe from freezing with a
lifting injector?

A. The overflow valve should be opened just enough to permit a little
steam to escape through the overflow pipe to prevent it from freezing.

62. Q. Name the various parts of the injector.

A. The injector consists of a body supplied with a steam valve, a steam
nozzle, a primer, a combining tube, a delivery tube, a line check valve,
an overflow valve, a water valve, and a lifting injector has a lifting
tube.

63. Q. What may be done if a combining tube is obstructed?

A. The steam valve bonnet may be removed and the obstruction forced out
with a piece of stiff wire, or uncouple the delivery pipe from the
injector and unscrew and remove the tubes; the obstruction can then be
removed and the tubes replaced.

64. Q. How is the greatest injury done to a boiler when cleaning or
knocking the fire?

A. By excessive use of the blower drawing cold air through the fire-box
and flues.

65. Q. Why does putting a large quantity of cold water into a boiler
when the throttle is closed cause the flues to leak? When is this most
serious?

A. When steam is not being used there is not much circulation of water
in the boiler, and the water entering the boiler at about 150 degrees
temperature is heavier than the water in the boiler. The cooler water
will go to the bottom and reduce the temperature in that part of the
boiler and causing the flues to contract in length as well as in
diameter and this has a tendency to pull them out of the sheet. This
will loosen them and cause them to leak. After the fire has been knocked
this tendency is much greater, and for that reason cold water should not
be put into a boiler after the fire has been knocked out. Always fill
the boiler before the fire