A 5 inch gauge Crampton, not a design we see regularly (I think I've had one other in the last ten years). Surely one of the most distinctive of the prehistoric designs, they went down a riot on the continent but didn't bring their creator a lot of business in his home country.
Silver soldered copper boiler, 90psi working pressure, feed by twin axle pump with a hand pump in the tender. Outside cylinders with slide valves actuated by Stephenson's gear with screw reverser on the footplate (where it is easy to mistake for a brake).
This one looks to have been run very little - mechanically it's in good order and the boiler is sound. We've had it running which it does with some elan blocked up on the bench, less convincing on the rolling road which appears to be down to soggy leaf springs on the driving axle.
Hydraulic test conducted 27/11/2012 at 180psi for 90psi working pressure
Length 29 inches
Width 11 inches
Height 16 inches
Length 18 inches
Width 9 inches