This lubricator has a glass viewing port, needle valve control and drain. All connections
are designed as 1/4-40 MPT, but can be altered as needed to suit your application.
It may be a bit large for a 3/4" or 1" engine, but is easy to scale.
This modified design is based on one originally provided by Ben Nixon for 1-1/2"
scale or larger locos.
This wonderful design seals well (doesn't leak to atmosphere) and blows open when needed if you
should slug the cylinders.
You need steam from the turret to keep them closed. Again, you need
to know how to silver solder, as well as fit small(ish) o-rings to reasonable tolerances.
This mechanical lubricator is based on traditional reciprocating plungers
with a ratchet wheel. I use it on my 1-1/2" loco and it works just fine.
Some silver soldering and lapping skills are required.
If you are building an Allen Loco, and want to have equalized brakes, you might
want to look at these drawings. Although they show my design for a 2-8-0,
it is easy to just chop out one axle for a mogul or 10-wheeler.