Strange Oiler

Below are some pictures of an unusual (to me) oiler that I am trying to figure out what it was originally used for. There is a central plunger that appears to actuate a pump within the glass chamber and also a small cam action lever that seems to work like the on/off valve on a typical engine or machine drip oiler. The metal cylinder has a gauge with markings I have never seen before.  The metal parts all appear to be nickel plated brass.  If you can help with information please contact me at the email address below.

Thanks,

Larry

 

Identification made - This has been determined to be a pump to operate a friction clutch to control the speed of a large fan in a building ventilation system.  The pump portion would adjust the pressure on the clutch plates to change the fan speed.

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Updated: April 2, 2010

laser 1710
laser 1710