31. Murdoch also made innovations to the steam engine, including the sun and planet gear and D slide valve . 32. The slide valve is controlled by a fixed crank on the crankshaft . The engine is not reversible. 33. The power cylinders were however mounted inside the frames and the Bagnall-Price valvgear and slide valves mounted outside. 34. References to a Clerk engine with slide valve may refer to the earlier experiments with a Lenoir type engine. 35. The cylinders and slide valve faces were lubricated by tallow cups, attached to the sides of the cylinder assembly. 36. The engine used Richardson slide valves , arranged above the cylinders and actuated by the Stephenson motion and rocker shafts. 37. They had flat Murdoch's D slide valves which were actuated by Stephenson valve gear, arranged outside the plate frames. 38. The pipeline's disabled segment has been closed off by slide valves but there is a danger of more leaks. 39. Their cylinders and slide valve faces were lubricated by tallow cups, attached to the sides of the cylinder assemblies. 40. The engine valvegear was simple, compared to Eccentrics on this shaft actuated a transverse slide valve for each cylinder.
