we are offering Four Stroke Petrol Engine Modelair cooled, four stroke, with operation of valves clearly shown. Mounted on a polished wooden base with schematic diagram, overall height 450 mm approx ring and ball apparatusbar & gaugeexpansion apparatuscompound barexpansion of liquid appartushope's appartuscalorimeter setcalorimeter joule'ssteam boilerthermal conductivity of metals apparatusingenhousz's apparatusconvection of heat in air apparatuscrooke's radiomaterswitch unitfly wheel friction calorimeter 4 stroke petrol engine4 stroke diesel enginemodel of steam enginemirror, plane