Abstract: A first lawn mowing vehicle formed of self-propelled configuration mounts a second lawn mowing vehicle utilizing a frame assembly. The frame assembly is pivotally mounted to the first lawn mowing vehicle and to the second lawn mowing vehicle, with the second lawn mowing vehicle projecting through a housing receiving opening in the frame assembly, with the frame assembly rear distal end pivotally mounted to a first vehicle frame plate fixedly mounted to the first vehicle between forward and rear wheels of the first vehicle. A throttle cable is directed from the second vehicle to the first vehicle and mounted to a pivot handle secured to a support post adjacent the first vehicle frame plate.

Abstract: Disclosed are cell-type ignition devices for Otto cycle internal combustion engines, said devices having cylindrical cells with end orifices communicating with the engine combustion chamber. The devices include housing and mounting means for thermally isolating the cell from the cooled engine wall and the ambient atmosphere. Critical ratios for cell dimensions are disclosed. Some embodiments are equipped with supplementary glow or spark ignition means for starting and warm-up. In some embodiments, sleeves or external protubances on the cell wall are employed to regulate ignition timing by controlling heat transfer.

Abstract: Disclosed are cell-type ignition devices for Otto cycle internal combustion engines, said devices having cylindrical cells with end orifices communicating with the engine combustion chamber. The devices include housing and mounting means for thermally isolating the cell from the cooled engine wall and the ambient atmosphere. Critical ratios for cell dimensions are disclosed. Some embodiments are equipped with supplementary glow or spark ignition means for starting and warm-up. In some embodiments, sleeves or external protubances on the cell wall are employed to regulate ignition timing by controlling heat transfer.