Hackworth's Model 0-4-0 Locomotive

From J.E. Minns,  Model Railway Engines (London:  Weidenfeld and Nicolson, 1969).  The author writes:

"Timothy Hackworth's little-known 4-1/2 gauge model 0-4-0 locomotive.  It is the original design of the Sans Pareil of 1826.  Here one can see how closely Hackworth and Stephenson worked.  The vertical semi-immersed cylinders and valve arrangement are typical of Stephenson's Killingworth engines, whilst the method of connecting is reminiscent of Hedley's model.  It is hot-coals-fired.  13-1/2 ins by 9-1/2 ins long."