Editing Steam engine (section)

=== Oscillating cylinder steam engines ===
{{Main|Oscillating cylinder steam engine}}

An oscillating cylinder steam engine is a variant of the simple expansion steam engine which does not require [[valve gear|valves]] to direct steam into and out of the cylinder. Instead of valves, the entire cylinder rocks, or oscillates, such that one or more holes in the cylinder line up with holes in a fixed port face or in the pivot mounting ([[trunnion]]). These engines are mainly used in toys and models because of their simplicity, but have also been used in full-size working engines, mainly on [[Marine steam engine#Oscillating|ships]] where their compactness is valued.<ref>{{cite book |last1=Seaton |first1=A E |title=Manual of Marine Engineering |date=1918 |publisher=Charles Griffin |location=London |pages=56–108}}</ref>