95 BULLETIN 173, U. S. NATIONAL MUSEUM 



SO control the rate at which oil is fed from the reservoir. The nut 

 carries a spring-held pin that rests in shallow recesses in the top of 

 the oiler and holds the nut in the position in which it is set and will 

 not permit the nut to be jarred around by the vibration of the ma- 

 chine to which it is attached. 



INTERMITTENT GRAVITY OILER 



U.S.N.M. no. 311184 ; model ; transferred from the United States Patent Office ; 

 not illustrated. 



This is a gravity oiler similar to the above in which the lubricating 

 oil is contained in a glass reservoir from which it flows by its own 

 weight through a valve in the bottom of the reservoir. The valve 

 through which the oil flows is a small conical valve held closed by 

 tlie weight of the oil above it. A stem projects downward from the 

 lubricator, which when pushed upward lifts the valve from its seat 

 and allows the oil to flow. It is probable that this lubricator was 

 designed to release a drop of oil upon the surfaces of some slow-mov- 

 ing machine, such as the guides of a planer when a cam or lug on the 

 moving part engaged the valve stem and raised it. 



HAND-PUMP PRESSURE LUBRICATOR 



U.S.N.M. no. 311185; original; transferred from the United States Patent Office; 

 not illustrated. 



This is a pressure lubricator designed to force lubricating oil into 

 the steam being supplied to a steam engine for the lubrication of the 

 piston and valves. It forces the oil into the steam main against the 

 pressure of the steam. It consists of a large glass reservoir into which 

 is built a small simple hand pump. By working the handle of the 

 pump the oil is drawn into the pump cylinder and discharged through 

 the screw fitting at the bottom of the lubricator into the steam main 

 or valve chest to which the lubricator is attached. The efficiency of 

 lubricators of this kind depends entirely upon the judgment of the 

 engineer or oiler. They are generally wasteful of oil. 



The lubricator is marked "Buckeye Engine Company." 



MULTIPLE HYDROSTATIC LUBRICATOR 

 Plate 21, Figube 1 



U.S.N.M. no. 308685 ; original patent model ; transferred from the United States 

 Patent Office ; photograph no. 32628B. 



This is an automatic lubricator that delivers lubricating oil into the 

 steam being supplied to a steam engine at any desired rate. It employs 

 the pressure due to a column of water plus the pressure of the steam 

 in the main to force the oil into the main against the steam pressure. 



