As luck would have it, a Cornishman was selling the Worthington-Simpson pump off his traction engine on Ebay. Whilst I didn't need the pump, I noticed in one of the pictures that it had a suitable displacement lubricator on top of it. I enquired as to whether the seller was willing to sell the lubricator on its own and, to cut a long story short, I now have it. (This lubricator, being of the type normally used for a WS pump, will be used for that purpose; the previous one can now be redeployed for steam brake oiling).
When complete, the lubricator is almost identical to the one in the photo below.
|Colin Evans's Displacement Lubricator|
The various bits and pieces are shown below:
|Tube with its threaded hole in the valve box|
|Threaded hole to the right in the valve box (or whatever it should be called!)|
|Reassembled curved tube|
One mystery remains with this lubricator. Most displacement lubricators seem to have a valve for draining condensate to the outside world. This one's drain valve releases the condensate back into the steam and oil connection.
|The point of the valve seat is to the right of the bottom of the inlet/outlet hole shown|
(same for both valves)