Abstract: The engines may be either the swing beam or the rocker beam type and each has its crankshaft in a central, transverse plane of the block. Each engine has at least one pair of cylinders with each having a piston and a head. A link pivotally connected to each piston is connected to the appropriate one of a pair of beams, one on each side of the central plane and each pivotally connected to the block. Each beam is pivotally connected to the appropriate one of the crankshaft connecting rods. The moving paired parts, i.e. the pistons, links, beams and connecting rods, are so formed and positioned with reference to the central transverse plane that a plane inclusive of any feature of the moving parts and the crankshaft axis defines an angle with respect to a plane inclusive of the corresponding feature on the opposite side of the central plane and the crankshaft axis that does not exceed .+-.4.degree.

Abstract: The engines may be of either the swing beam or the rocker beam type and each has its crankshaft in a central, transverse plane of the block. Each engine has at least one pair of cylinders with each having a piston and a head. A link pivotally connected to each piston is connected to the appropriate one of a pair of beams, one on each side of the central plane and each pivotally connected to the block. Each beam is pivotally connected to the appropriate one of the crankshaft connecting rods. The moving paired parts, i.e. the pistons, links, beams and connecting rods, are so formed and positioned with reference to the central transverse plane that a plane inclusive of any feature of the moving parts and the crankshaft axis defines an angle with respect to a plane inclusive of the corresponding feature on the opposite side of the central plane and the crankshaft axis that does not exceed .+-. 4.degree.

Abstract: Wood burning stoves are of a type having a lower chamber and an upper chamber interconnected by a port. Air inlets are located laterally of the base of a fire in the lower chamber with a natural draft therein effecting a multitude of upwardly rising air streams of which one type is hot and oxygen poor and which carry and heat another type of air stream which is oxygen rich. The port is so dimensioned and spaced in relation to the lower chamber and to the flue outlet of the upper chamber that a secondary combustion zone is provided in which the upwardly rising streams are suddenly contracted, expanded and intermingled with simultaneous heat loss minimized ensuring the maintenance of a temperature adequate to result in the combustion of pyrolitic products.