A model Stuart vertical reversing five pillar compound launch engine with blued steel clad cylinders ¾ and 1¼in bores x 7/8in stroke, draincocks, lever and quadrant operated Stephenson's link reverse (engine does not run in reverse), shaft coupling to gear and eccentric driven feed pump and disc flywheel, unpainted -- 6 x 8½in (15.2 x 21.5cm) Wood base.