A triple expansion engine built to the O B Bolton design, serialised in "Model Engineer" by John Bertinat - Reeves still stock the drawings and castings for this one. It's been on display for many years, inherited by the owner from the late builder's estate. We gave it an oil round and ran it on air in the workshop, it goes well.
Complete with condensor and air pump.
Cylinders 7/8 + 1 1/4 + 1 3/4 x 1 1/4
Base 12 x 8 inches
Weight 23 pounds