If you have no whetstone, put some fine sand or
gritty soil in the hole, put the valve on top of it, put your brace on
the valve and turn it vigorously for a few minutes, and you will remove
all roughness.
Constant use may sometimes make a burr on the valve which will cause it
to stick. Put it through the above course and it will be as good as
new. If this little process was generally known, a great deal of
trouble and annoyance could be avoided.
It will not be necessary to describe other styles of pumps. If you know
how to run the cross head pump, you can run any of the others. Some
engines have cross head pump only. Others have an independent pump.
Others have an injector, or inspirator, and some have both cross head
pump and injector. I think a farm engine should be supplied with both.
It is neither wise nor necessary to go into a detailed description of an
injector. The young reader will be likely to become convinced if an
injector works for five minutes, it will continue to work, if the
conditions remain the same. If the water in the tank does not become
heated, and no foreign substance is permitted to enter the injector,
there is nothing to prevent its working properly as long as the
conditions are within the range of a good injector.
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