THE FEED WATER. 21 



we advise engineers to allow the pump to exhaust into the 

 air. The most of the trouble with these pumps is due to 

 insufficient lubrication, and the successful operators use 

 plenty of cylinder oil. If the exhaust be turned in at all 

 times, this cylinder oil is carried into the boiler where it 

 accumulates, in some cases in sufficient quantities to render 

 it dangerous to the plates of the boiler. Consequently, for 

 this reason and also because the pump is more easily "kept 

 up" when exhausting in the air, we do not advise turning 

 the exhaust into the feed water. 



Starting the "Marsh" Pump. Before attaching the lubri- 

 cator, it is a good plan to pour some cylinder oil into the 

 pipe. To start the pump, first see that the valve in the feed 

 pipe, between the check valve and the boiler, is open, and 

 that the exhaust lever is thrown towards the steam end of 

 the pump. The steam may now be turned on, and if the 

 piston rod does not move back and forth, tap the starter-pins 

 very lightly. It is well to run the pump without water until 

 thoroughly oiled, but as soon as it is running smoothly, the 

 suction may be opened. Opening the cock with the thread 

 for attaching the sprinkling hose or the small air-cock in the 

 water chamber will aid the pump in "picking up" water. 



When the Pump Will Not Start. I. If the pump does 

 not start when steam is turned on, push the starter-pins 

 alternately, to see if the valve moves easily back and forth. 

 If the valve sticks, do not hammer the starter-pins or force 

 them too hard, but remove the valve in order to locate the 



