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A gaseous fuel-air mixture device for an internal combustion engine having an intake for a fuel-air mixture. A chamber for mixing gaseous fuel and air is provided above the intake. The gaseous fuel is uniformly injected into the mixture chamber from an aperture in the chamber wall. The quantity of a

A gaseous fuel-air mixture device for an internal combustion engine having an intake for a fuel-air mixture. A chamber for mixing gaseous fuel and air is provided above the intake. The gaseous fuel is uniformly injected into the mixture chamber from an aperture in the chamber wall. The quantity of air mixed with the gaseous fuel in the mixture chamber is controlled by adjusting the height of a control plate disposed above the chamber.

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A gaseous fuel-air mixer for an internal combustion engine having an intake for a fuel-air mixture, said intake being a liquid fuel conventional carburetor inlet and said gaseous fuel-air mixer comprising a tubular member mounted at said carburetor inlet, said tubular member surrounding said inlet a

A gaseous fuel-air mixer for an internal combustion engine having an intake for a fuel-air mixture, said intake being a liquid fuel conventional carburetor inlet and said gaseous fuel-air mixer comprising a tubular member mounted at said carburetor inlet, said tubular member surrounding said inlet and having an open end through which air is admitted, means for supplying a gaseous fuel to a mixing chamber defined within said tubular member, and a generally flat plate, said plate being axially adjustable along the carburetor inlet axis and disposed across the open end of said tubular member defining said mixing chamber for adjusting the proportion of air admitted to said mixing chamber, wherein said gaseous fuel is supplied to said mixing chamber through an aperture in said tubular member, said tubular member has a pair of parallel circularly cylindrical walls disposed concentrically for forming therebetween an annular chamber, and said aperture is a circular slot in the innermost of said cylindrical walls.