Abstract: A multi-fuel system which will operate the usual factory-manufactured gasoline powered internal combustion engine efficiently on any one of a number of different fuels without modifying or changing the engine. The system involves a non-venturi type of carburetor having a metered inlet and means for controlling the pressure of each fuel delivered to the inlet in accordance with the stoichiometric ratio of that fuel which assures that the proper fuel/air ratio is delivered to the mixing chamber of the carburetor without requiring any change in either the carburetor or engine when a different fuel is used. Additionally, the fuel delivered to the fuel inlet is then directed into the fuel/air mixing chamber without subjecting the fuel to the suction in the intake manifold of the engine.

Abstract: A carburetor for internal combustion engines having a stationary metering element and a rotor assembly which is movable and rotatable with respect to the metering element to control the fuel-air mixture and to thoroughly admix the fuel and air before its passage to the engine.

Abstract: An apparatus for measuring the stress changes in an underground formation or in concrete or other structures such as bridges, tunnels or the like which includes a sensor unit having a stress or pressure sensitive element exposed to the area under measurement and a hydraulic measurement system actuated by said element so that changes in stress forces or pressure in said area are reflected by changes in the hydraulic measuring system, and a means for converting the changes in said hydraulic system into a visible or recorded indication of said changes to thereby provide a measurement of the stress or pressure changes.