Abstract: A gaseous fuel control system for regulating fuel flow to a dual fuel internal combustion engine has a phase converter for converting the fuel from a liquid state to a gaseous state and control means for controlling the supply of fuel to the engine in response to sensor signals including a throttle position signal and an alternator signal. A valve actuated by the control means regulates the supply of said fuel in a gaseous state, which is mixed with air in the engine manifold. A display mounted in the vehicle cabin includes a fuel gauge, an override switch and means for adjusting the parameters for the control of supply of fuel. The control means is programmed to close the valve means, preventing the supply of said fuel, when the throttle position is in an idling position or substantially fully open and when the engine is not operating.

Abstract: A gaseous fuel control system for regulating fuel flow to a dual fuel internal combustion engine has a phase converter for converting the fuel from a liquid state to a gaseous state and control means for controlling the supply of fuel to the engine in response to sensor signals including a throttle position signal and an alternator signal. A valve actuated by the control means regulates the supply of said fuel in a gaseous state, which is mixed with air in the engine manifold. A display mounted in the vehicle cabin includes a fuel gauge, an override switch and means for adjusting the parameters for the control of supply of fuel. The control means is programmed to close the valve means, preventing the supply of said fuel, when the throttle position is in an idling position or substantially fully open and when the engine is not operating.

Abstract: Optical fibres and optical cables of improved bandwidth, especially intended for use in a communications system. Over-compensated and under-compensated fibres or cable sections are connected alternately so that each fibre or cable section tends to correct the modal dispersion originating in the previous fibre or cable section, giving a narrower overall impulse response and hence a better bandwidth. This arrangement also substantially reduces the variation of bandwidth with source wavelength.