For stationary engines the double connection is preferable, and should
always be connected to the live steam pipe above the throttle. The
discharge arm should always be long enough (4 to 6 inches) to insure the
oil magazine and condenser from getting too hot, otherwise it will not
condense fast enough to give continuous feed of oil. For traction or
road engines the single connection is used. These can be connected to
live steam pipe or directly to steam chest.
In a general way it may be stated that certain precaution must be taken
to insure the satisfactory operation of all sight-feed lubricators. Use
only the best of oil, one gallon of which is worth five gallons of cheap
stuff and do far better service, as inferior grades not only clog the
lubricator but chokes the ducts and blurs the sight-glass, etc., and the
refuse of such oil will accumulate in the cylinder sufficiently to cause
damage and loss of power, far exceeding the difference in cost of good
oil over the cheap grades.
After attaching a lubricator, all valves should be opened wide and live
steam blown through the outer vents for a few minutes to insure the
openings clean and free.
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