Gwr Vacuum Pump

Dog Star

Western Thunderer
I am looking for a drawing or diagram of the internals of the vacuum pump... maybe an illustration from either Ernie Nutty's books or the BR manual for enginemen.

Not to make a model... just to remind myself as to how the device works - more than 30 years since I last serviced such a piece of engineering and the memory has failed me.

regards, Graham
 
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